Guides › Every NPB Player Who Went to MLB
This is our list of Japanese players who played in Japan’s top league first and then made it to the major leagues. It starts in 1964. It runs through the 2026 MLB season.
Each row tells you four things. When the player made his MLB debut. Which Japanese team he played for before he left. Which MLB teams he played for. And whether he came over through the posting system.
Here’s the thing. A list like this is easy to get wrong. Names are spelled more than one way. Teams change names. Some players went home and then came back. So we kept the rules simple, and we checked the dates.
Quick Facts
- Players on this list: 73.
- First player: Masanori Murakami. He debuted on September 1, 1964.
- Came over through posting: 29 of the 73.
- Most common Japanese team right before MLB: the Yomiuri Giants, with 9 players.
- Busiest ten years: the 2000s, with 29 MLB debuts.
- Covers: MLB debuts through the 2026 season.
How We Built This List
We started with Wikipedia’s list of MLB players from Japan. That list marks which players came through posting. It also marks players who never played in Japan’s top league.
Then we checked every MLB debut date against MLB’s own player records. All 73 dates matched.
For the Japanese teams, we used each player’s own Wikipedia page. We show only the years he played in Japan before his MLB debut. Many players went home later. We left those later years out to keep the list clean.
There is a lesson in that. When you build a list, you have to pick your rules first. Then you stick to them. Otherwise the list turns to mush.
Who Is Not on This List
Five players born in Japan made it to MLB without playing in Japan’s top league first. They are not in the main table, because this page is about NPB players. But they are part of the story.
- Mac Suzuki debuted in 1996. He signed with Seattle as a young player.
- Kazuhito Tadano debuted in 2004 with Cleveland.
- Junichi Tazawa debuted in 2009 with Boston. He signed out of a company team in Japan.
- Toru Murata debuted in 2015 with Cleveland.
- Rikuu Nishida debuted in 2026 with the Chicago White Sox.
Some of these players went to Japan’s top league later. Tadano and Murata both pitched for the Fighters after their time in MLB.
How Players Get from Japan to MLB
There are three main ways a player in Japan can get to MLB.
1. Posting. The player is still under contract. His team agrees to let him talk to MLB teams. The MLB team that signs him pays a fee to his Japanese team. To learn how it works, read our guide on how the NPB posting system works.
2. Free agency. The player has put in enough seasons in Japan. He can sign with any team in the world. No fee is paid. NPB’s rules say a player needs nine qualifying seasons for this.
3. Other paths. In the early days, there were no clear rules. Murakami went over in an exchange. Hideo Nomo retired from Japanese baseball so he could sign in America. Those cases led to the rules we have now.
The Story in Five Eras
You can read this list as one long story. It has five parts.
1964: The first one
Masanori Murakami was a young pitcher for the Nankai Hawks. His team sent him to America to learn. The San Francisco Giants called him up in September 1964. He pitched for them in 1964 and 1965. Then he went home.
After that, there was a long gap. No Japanese player debuted in MLB for 30 years.
1995 to 1999: Nomo opens the door
Hideo Nomo changed everything in 1995. He left the Kintetsu Buffaloes and joined the Los Angeles Dodgers. Fans went wild for his twisting windup. He was the National League Rookie of the Year.
Other pitchers followed. Shigetoshi Hasegawa. Hideki Irabu. Masato Yoshii. Masao Kida. Tomokazu Ohka. All of them debuted by the end of 1999. Seven NPB players on this list debuted in the 1990s.
Notice something? They were all pitchers. Here’s the thing. MLB teams at that time thought Japanese hitters would not have enough power. That idea did not last long.
2000 to 2009: The hitters arrive
In 2001, Ichiro Suzuki came over from the Orix BlueWave. He won the Rookie of the Year and the MVP in the American League in his first season. He proved that a Japanese hitter could be a star.
Then came Hideki Matsui from the Yomiuri Giants in 2003. Kazuo Matsui. Tadahito Iguchi. Kenji Johjima, the first Japanese catcher in the majors. Kosuke Fukudome.
Pitchers kept coming too. Daisuke Matsuzaka. Hiroki Kuroda. Koji Uehara. Kazuhiro Sasaki, a closer who came over from Yokohama in 2000.
The 2000s were the busiest ten years on the list. Twenty-nine NPB players made their MLB debuts in that decade.
2010 to 2019: The aces
The next ten years brought fewer players. But many of them were top pitchers.
Yu Darvish came from the Fighters in 2012. Hisashi Iwakuma came from Rakuten that same year. Masahiro Tanaka joined the Yankees in 2014. Kenta Maeda came from Hiroshima in 2016.
And in 2018, Shohei Ohtani arrived. He could pitch and hit. Nobody had done both at that level in a long time.
Seventeen NPB players debuted in the 2010s.
2020 and on: A new wave
Since 2020, the pace has picked up again. Nineteen NPB players debuted from 2020 through 2026.
This wave has both stars and depth. Seiya Suzuki. Masataka Yoshida. Kodai Senga. Yoshinobu Yamamoto. Shota Imanaga. Roki Sasaki. In 2026, sluggers Munetaka Murakami and Kazuma Okamoto made their debuts.
There is a lesson in that. Every player who did well made it easier for the next one. MLB teams now scout Japan like never before.
Which Japanese Teams Sent the Most
We counted the Japanese team each player was on right before his MLB debut.
The Yomiuri Giants lead with 9 players. Next come the Fighters, the Orix club and the Yakult Swallows, with 7 each when you count their old team names. The Chiba Lotte Marines have 6. The Hanshin Tigers have 5.
Team names in Japan change when owners change. The Orix BlueWave is now the Orix Buffaloes. The Daiei Hawks are now the SoftBank Hawks. The Yokohama BayStars are now the Yokohama DeNA BayStars. In the table, we use the name the team had at the time.
You can read about each club on our teams page.
Posted or Not?
Twenty-nine of the 73 players came over through posting. The rest came as free agents or by other paths.
Posting has been more common in recent years. Of the 19 players who debuted from 2020 through 2026, 14 came through posting. That includes Seiya Suzuki, Masataka Yoshida, Shota Imanaga, Yoshinobu Yamamoto, Roki Sasaki, Munetaka Murakami, Kazuma Okamoto and Tatsuya Imai.
Kodai Senga and Yuki Matsui did not need posting. They had enough years in Japan to leave as free agents.
How to Read the Table
- # is the order of MLB debuts.
- Player uses the name MLB fans know best.
- MLB debut is the date of his first MLB game.
- NPB team before MLB shows his Japanese team or teams, with years, before his debut.
- MLB teams shows each MLB team and the years he played there, through 2026.
- Posted? says “Yes” if he came over through the posting system.
Links go to our team pages. Older team names that no longer exist are not linked.
The Full List
| # | Player | MLB debut | NPB team before MLB | MLB teams | Posted? |
|---|---|---|---|---|---|
| 1 | Masanori Murakami | September 1, 1964 | Nankai Hawks (1963) | San Francisco Giants (1964–1965) | No |
| 2 | Hideo Nomo | May 2, 1995 | Kintetsu Buffaloes (1990–1994) | Los Angeles Dodgers (1995–1998, 2002–2004); New York Mets (1998); Milwaukee Brewers (1999); Detroit Tigers (2000); Boston Red Sox (2001); Tampa Bay Devil Rays (2005); Kansas City Royals (2008) | No |
| 3 | Shigetoshi Hasegawa | April 5, 1997 | Orix BlueWave (1990–1996) | Anaheim Angels (1997–2001); Seattle Mariners (2002–2005) | No |
| 4 | Hideki Irabu | July 10, 1997 | Lotte Orions / Chiba Lotte Marines (1988–1996) | New York Yankees (1997–1999); Montreal Expos (2000–2001); Texas Rangers (2002) | No |
| 5 | Takashi Kashiwada | May 1, 1997 | Yomiuri Giants (1994–1996) | New York Mets (1997) | No |
| 6 | Masato Yoshii | April 5, 1998 | Kintetsu Buffaloes (1985–1994); Yakult Swallows (1995–1997) | New York Mets (1998–1999); Colorado Rockies (2000); Montreal Expos (2001–2002) | No |
| 7 | Masao Kida | April 5, 1999 | Yomiuri Giants (1989–1997); Orix BlueWave (1998) | Detroit Tigers (1999–2000); Los Angeles Dodgers (2003–2004); Seattle Mariners (2004–2005) | No |
| 8 | Tomokazu Ohka | July 19, 1999 | Yokohama BayStars (1994–1998) | Boston Red Sox (1999–2001); Montreal Expos/Washington Nationals (2001–2005); Milwaukee Brewers (2005–2006); Toronto Blue Jays (2007); Cleveland Indians (2009) | No |
| 9 | Kazuhiro Sasaki | April 5, 2000 | Yokohama Taiyō Whales / Yokohama BayStars (1990–1999) | Seattle Mariners (2000–2003) | No |
| 10 | Ichiro Suzuki | April 2, 2001 | Orix BlueWave (1992–2000) | Seattle Mariners (2001–2012, 2018–2019); New York Yankees (2012–2014); Miami Marlins (2015–2017) | Yes |
| 11 | Tsuyoshi Shinjo | April 3, 2001 | Hanshin Tigers (1991–2000) | New York Mets (2001, 2003); San Francisco Giants (2002) | No |
| 12 | Takahito Nomura | April 3, 2002 | Orix BlueWave (1991–1997); Yomiuri Giants (1998–2001) | Milwaukee Brewers (2002) | No |
| 13 | Satoru Komiyama | April 4, 2002 | Lotte Orions/Chiba Lotte Marines (1990–1999); Yokohama BayStars (2000–2001) | New York Mets (2002) | No |
| 14 | Kazuhisa Ishii | April 6, 2002 | Yakult Swallows (1992–2001) | Los Angeles Dodgers (2002–2004); New York Mets (2005) | Yes |
| 15 | So Taguchi | June 10, 2002 | Orix BlueWave (1992–2001) | St. Louis Cardinals (2002–2007); Philadelphia Phillies (2008); Chicago Cubs (2009) | No |
| 16 | Hideki Matsui | March 31, 2003 | Yomiuri Giants (1993–2002) | New York Yankees (2003–2009); Los Angeles Angels of Anaheim (2010); Oakland Athletics (2011); Tampa Bay Rays (2012) | No |
| 17 | Kazuo Matsui | April 6, 2004 | Seibu Lions (1994–2003) | New York Mets (2004–2006); Colorado Rockies (2006–2007); Houston Astros (2008–2010) | No |
| 18 | Akinori Otsuka | April 6, 2004 | Kintetsu / Osaka Kintetsu Buffaloes (1997–2002); Chunichi Dragons (2003) | San Diego Padres (2004–2005); Texas Rangers (2006–2007) | Yes |
| 19 | Shingo Takatsu | April 9, 2004 | Yakult Swallows (1991–2003) | Chicago White Sox (2004–2005); New York Mets (2005) | No |
| 20 | Norihiro Nakamura | April 10, 2005 | Kintetsu Buffaloes / Osaka Kintetsu Buffaloes (1992–2004) | Los Angeles Dodgers (2005) | Yes |
| 21 | Tadahito Iguchi | April 4, 2005 | Fukuoka Daiei Hawks (1997–2004) | Chicago White Sox (2005–2007); Philadelphia Phillies (2007, 2008); San Diego Padres (2008) | No |
| 22 | Keiichi Yabu | April 9, 2005 | Hanshin Tigers (1994–2004) | Oakland Athletics (2005); San Francisco Giants (2008) | No |
| 23 | Kenji Johjima | April 3, 2006 | Fukuoka Daiei / Fukuoka SoftBank Hawks (1995–2005) | Seattle Mariners (2006–2009) | No |
| 24 | Takashi Saito | April 9, 2006 | Yokohama Taiyo Whales / Yokohama BayStars (1992–1996, 1998–2005) | Los Angeles Dodgers (2006–2008); Boston Red Sox (2009); Atlanta Braves (2010); Milwaukee Brewers (2011); Arizona Diamondbacks (2012) | No |
| 25 | Akinori Iwamura | April 2, 2007 | Yakult Swallows / Tokyo Yakult Swallows (1998–2006) | Tampa Bay Devil Rays/Rays (2007–2009); Pittsburgh Pirates (2010); Oakland Athletics (2010) | Yes |
| 26 | Hideki Okajima | April 2, 2007 | Yomiuri Giants (1994–2005); Hokkaido Nippon-Ham Fighters (2006) | Boston Red Sox (2007–2011); Oakland Athletics (2013) | No |
| 27 | Daisuke Matsuzaka | April 5, 2007 | Seibu Lions (1999–2006) | Boston Red Sox (2007–2012); New York Mets (2013–2014) | Yes |
| 28 | Kei Igawa | April 7, 2007 | Hanshin Tigers (1998–2006) | New York Yankees (2007–2008) | Yes |
| 29 | Masumi Kuwata | June 10, 2007 | Yomiuri Giants (1986–2006) | Pittsburgh Pirates (2007) | No |
| 30 | Masahide Kobayashi | April 2, 2008 | Chiba Lotte Marines (1997–2007) | Cleveland Indians (2008–2009) | No |
| 31 | Hiroki Kuroda | April 4, 2008 | Hiroshima Toyo Carp (1997–2007) | Los Angeles Dodgers (2008–2011); New York Yankees (2012–2014) | No |
| 32 | Yasuhiko Yabuta | April 5, 2008 | Chiba Lotte Marines (1996–2007) | Kansas City Royals (2008–2009) | No |
| 33 | Kosuke Fukudome | March 31, 2008 | Chunichi Dragons (1999–2007) | Chicago Cubs (2008–2011); Cleveland Indians (2011); Chicago White Sox (2012) | No |
| 34 | Kazuo Fukumori | March 31, 2008 | Yokohama BayStars (1995–2003); Osaka Kintetsu Buffaloes (2004); Tohoku Rakuten Golden Eagles (2005–2007) | Texas Rangers (2008) | No |
| 35 | Kenshin Kawakami | April 11, 2009 | Chunichi Dragons (1998–2008) | Atlanta Braves (2009–2010) | No |
| 36 | Koji Uehara | April 8, 2009 | Yomiuri Giants (1999–2008) | Baltimore Orioles (2009–2011); Texas Rangers (2011–2012); Boston Red Sox (2013–2016); Chicago Cubs (2017) | No |
| 37 | Ken Takahashi | May 2, 2009 | Hiroshima Toyo Carp (1995–2008) | New York Mets (2009) | No |
| 38 | Hisanori Takahashi | April 7, 2010 | Yomiuri Giants (2000–2009) | New York Mets (2010); Los Angeles Angels of Anaheim (2011–2012); Pittsburgh Pirates (2012); Chicago Cubs (2013) | No |
| 39 | Ryota Igarashi | April 8, 2010 | Yakult Swallows/Tokyo Yakult Swallows (1998–2009) | New York Mets (2010–2011); Toronto Blue Jays (2012); New York Yankees (2012) | No |
| 40 | Tsuyoshi Nishioka | April 1, 2011 | Chiba Lotte Marines (2003–2010) | Minnesota Twins (2011–2012) | Yes |
| 41 | Yoshinori Tateyama | May 24, 2011 | Nippon-Ham Fighters / Hokkaido Nippon-Ham Fighters (1999–2010) | Texas Rangers (2011–2012) | No |
| 42 | Hisashi Iwakuma | April 20, 2012 | Osaka Kintetsu Buffaloes (2000–2004); Tohoku Rakuten Golden Eagles (2005–2011) | Seattle Mariners (2012–2017) | No |
| 43 | Nori Aoki | April 6, 2012 | Yakult Swallows/Tokyo Yakult Swallows (2004–2011) | Milwaukee Brewers (2012–2013); Kansas City Royals (2014); San Francisco Giants (2015); Seattle Mariners (2016); Houston Astros (2017); Toronto Blue Jays (2017); New York Mets (2017) | Yes |
| 44 | Munenori Kawasaki | April 7, 2012 | Fukuoka SoftBank Hawks (2001–2011) | Seattle Mariners (2012); Toronto Blue Jays (2013–2015); Chicago Cubs (2016) | No |
| 45 | Yu Darvish | April 9, 2012 | Hokkaido Nippon-Ham Fighters (2005–2011) | Texas Rangers (2012–2017); Los Angeles Dodgers (2017); Chicago Cubs (2018–2020); San Diego Padres (2021–2025) | Yes |
| 46 | Kyuji Fujikawa | April 1, 2013 | Hanshin Tigers (2000–2012) | Chicago Cubs (2013–2014); Texas Rangers (2015) | No |
| 47 | Kensuke Tanaka | July 9, 2013 | Nippon-Ham Fighters/Hokkaido Nippon-Ham Fighters (2000–2012) | San Francisco Giants (2013) | No |
| 48 | Masahiro Tanaka | April 4, 2014 | Tohoku Rakuten Golden Eagles (2007–2013) | New York Yankees (2014–2020) | Yes |
| 49 | Tsuyoshi Wada | July 8, 2014 | Fukuoka Daiei Hawks/Fukuoka SoftBank Hawks (2003–2011) | Chicago Cubs (2014–2015) | No |
| 50 | Kenta Maeda | April 6, 2016 | Hiroshima Toyo Carp (2008–2015) | Los Angeles Dodgers (2016–2019); Minnesota Twins (2020–2023); Detroit Tigers (2024–2025) | Yes |
| 51 | Shohei Ohtani | March 29, 2018 | Hokkaido Nippon-Ham Fighters (2013–2017) | Los Angeles Angels (2018–2023); Los Angeles Dodgers (2024–2026) | Yes |
| 52 | Yoshihisa Hirano | March 29, 2018 | Orix Buffaloes (2006–2017) | Arizona Diamondbacks (2018–2019); Seattle Mariners (2020) | No |
| 53 | Kazuhisa Makita | March 30, 2018 | Saitama Seibu Lions (2011–2017) | San Diego Padres (2018) | Yes |
| 54 | Yusei Kikuchi | March 21, 2019 | Saitama Seibu Lions (2011–2018) | Seattle Mariners (2019–2021); Toronto Blue Jays (2022–2024); Houston Astros (2024); Los Angeles Angels (2025–2026) | Yes |
| 55 | Yoshi Tsutsugo | July 24, 2020 | Yokohama BayStars/Yokohama DeNA BayStars (2010–2019) | Tampa Bay Rays (2020–2021); Los Angeles Dodgers (2021); Pittsburgh Pirates (2021–2022) | Yes |
| 56 | Shogo Akiyama | July 24, 2020 | Saitama Seibu Lions (2011–2019) | Cincinnati Reds (2020–2021) | No |
| 57 | Shun Yamaguchi | July 26, 2020 | Yokohama BayStars/Yokohama DeNA BayStars (2006–2016); Yomiuri Giants (2017–2019) | Toronto Blue Jays (2020) | Yes |
| 58 | Hirokazu Sawamura | April 2, 2021 | Yomiuri Giants (2011–2016, 2018–2020); Chiba Lotte Marines (2020) | Boston Red Sox (2021–2022) | No |
| 59 | Kohei Arihara | April 3, 2021 | Hokkaido Nippon-Ham Fighters (2015–2020) | Texas Rangers (2021–2022) | Yes |
| 60 | Seiya Suzuki | April 7, 2022 | Hiroshima Toyo Carp (2013–2021) | Chicago Cubs (2022–2026) | Yes |
| 61 | Shintaro Fujinami | April 1, 2023 | Hanshin Tigers (2013–2022) | Oakland Athletics (2023); Baltimore Orioles (2023) | Yes |
| 62 | Kodai Senga | April 2, 2023 | Fukuoka SoftBank Hawks (2012–2022) | New York Mets (2023–2026) | No |
| 63 | Masataka Yoshida | March 30, 2023 | Orix Buffaloes (2016–2022) | Boston Red Sox (2023–2026) | Yes |
| 64 | Shota Imanaga | April 1, 2024 | Yokohama DeNA BayStars (2016–2023) | Chicago Cubs (2024–2026) | Yes |
| 65 | Yoshinobu Yamamoto | March 20, 2024 | Orix Buffaloes (2017–2023) | Los Angeles Dodgers (2024–2026) | Yes |
| 66 | Yuki Matsui | March 20, 2024 | Tohoku Rakuten Golden Eagles (2014–2023) | San Diego Padres (2024–2026) | No |
| 67 | Naoyuki Uwasawa | May 2, 2024 | Hokkaido Nippon-Ham Fighters (2014–2023) | Boston Red Sox (2024) | Yes |
| 68 | Shinnosuke Ogasawara | July 6, 2025 | Chunichi Dragons (2016–2024) | Washington Nationals (2025) | Yes |
| 69 | Roki Sasaki | March 19, 2025 | Chiba Lotte Marines (2021–2024) | Los Angeles Dodgers (2025–2026) | Yes |
| 70 | Tomoyuki Sugano | March 30, 2025 | Yomiuri Giants (2013–2024) | Baltimore Orioles (2025); Colorado Rockies (2026) | No |
| 71 | Munetaka Murakami | March 26, 2026 | Tokyo Yakult Swallows (2018–2025) | Chicago White Sox (2026) | Yes |
| 72 | Kazuma Okamoto | March 27, 2026 | Yomiuri Giants (2015–2025) | Toronto Blue Jays (2026) | Yes |
| 73 | Tatsuya Imai | March 29, 2026 | Saitama Seibu Lions (2018–2025) | Houston Astros (2026) | Yes |
Five Firsts Worth Knowing
Some names on this list did something no one had done before. Here are five of them.
The first pitcher. Masanori Murakami was the first. He was a lefty. He pitched in relief for the Giants. He was only 20 years old when he debuted. He went home to Japan and pitched there for many more years.
The first big star. Hideo Nomo was the first Japanese star in MLB. His windup was hard to forget. He turned his back to the hitter. Then he spun and threw. Kids in Japan stayed up late to watch him on TV.
The first star hitter. Ichiro Suzuki was the first Japanese position player to become a star. He hit the ball to every part of the field. He ran fast. He threw hard from right field. People had said a Japanese hitter could not make it. He showed they were wrong.
The first catcher. Kenji Johjima came from the Hawks in 2006. Catchers have a hard job. They must learn every pitcher’s stuff. They must talk with them all game. Doing that in a new language is hard. He did it for four seasons in Seattle.
The first true two-way star. Shohei Ohtani came from the Fighters in 2018. He was a top pitcher. He was also a top hitter. Teams had told players for years to pick one. He did not pick. He did both.
There is a lesson in that. Each first made the next step easier. When one person breaks a wall, the rest can walk through.
Tips for Using This Page
This list is long. Here are a few ways to use it.
- Find your team. Use your browser’s search to look for a team name. You will see every player from that club.
- Find a year. Look for a year in the MLB debut column. You will see who came over that season.
- Find the posted players. Look for “Yes” in the last column.
- Go deeper. Click a team name to see that club’s page on our site.
Here’s the thing. A list is only a start. Each name has a story. Pick one you don’t know. Look him up. You might find your new favorite player.
What the List Tells Us
Look at the whole list and a few things jump out.
Pitchers came first. The first wave in the 1990s was all pitchers. Hitters did not show up until Ichiro in 2001.
Many wait a long time. Stars in Japan often have to wait years to be posted or to reach free agency. So many reach MLB after a long career at home. Some, like Ohtani and Sasaki, chose to go young.
Big names come in clumps. Some years bring three or four players. Other years bring none. It depends on who is ready and whose team will let him go.
Many go home. A lot of players on this list went back to Japan later. Some came back as coaches or managers. That is part of why Japanese baseball and MLB keep growing closer.
Here’s the thing. Each name on this list was a star in Japan first. Many led their league in hits, home runs, wins or strikeouts. To see who led each league in a given year, check our season pages. Try the 2000 Pacific League page, Ichiro’s last season with Orix. Or the 2002 Central League page, Hideki Matsui’s last year with the Giants.
Key Terms
NPB. Nippon Professional Baseball. Japan’s top pro league.
MLB debut. A player’s first game in the major leagues.
Posting. A way for a Japanese team to let a player under contract sign with an MLB team, for a fee.
Free agent. A player who is free to sign with any team.
Two-way player. A player who both pitches and hits.
Common Questions
Who was the first Japanese player in MLB? Masanori Murakami. He debuted for the San Francisco Giants on September 1, 1964.
Who was the first Japanese position player in MLB? Ichiro Suzuki and Tsuyoshi Shinjo both debuted in April 2001. Ichiro’s first game was one day earlier.
Why is my favorite player missing? This page only lists players who played in Japan’s top league before MLB. If a player went straight to America, he is in the short list near the top instead.
How often is this list updated? New players arrive each year. We plan to update the list after each MLB season.
The Bottom Line
Seventy-three NPB players have made it to MLB, from Murakami in 1964 to the class of 2026. Each one opened the door a little wider.
There is a lesson in that. Nobody gets there alone. Nomo made room for Ichiro. Ichiro made room for Matsui. Darvish made room for Ohtani. And the next star is already playing somewhere in Japan.
Sources
- Wikipedia, “List of Major League Baseball players from Japan.” https://en.wikipedia.org/wiki/List_of_Major_League_Baseball_players_from_Japan (player list, posting markers, MLB teams; CC BY-SA 4.0)
- Wikipedia, individual player articles (Japanese teams and years, from each article’s infobox). For example https://en.wikipedia.org/wiki/Ichiro_Suzuki
- MLB Stats API, player records (MLB debut dates; all 73 dates cross-checked). https://statsapi.mlb.com/
- MLB.com Glossary, “Japanese Posting System.” https://www.mlb.com/glossary/transactions/japanese-posting-system
- Wikipedia, “Posting system.” https://en.wikipedia.org/wiki/Posting_system
- NPB, “フリーエージェントについて” (free agency rules). https://npb.jp/announcement/2015/fa_about.html
- Baseball-Reference, “Players born in Japan.” https://www.baseball-reference.com/bio/Japan_born.shtml