There are 7 Japanese MLB players played for the Tokyo Yakult Swallows
Norichika
Aoki
(Milwaukee Brewers, Kansas City Royals, San Francisco Giants, Seattle Mariners, Houston Astros, Toronto Blue Jays, New York Mets, Tokyo Yakult Swallows)
青木宣親 (あおき・のりちか)
Bats: L Throws: R
Current Age 42
5-9, 180lb (175cm, 81kg)
MLB Debut:
2012-04-06 (30)
Ryota
Igarashi
RHP 
New York Mets
(New York Mets, Toronto Blue Jays, New York Yankees, Tokyo Yakult Swallows, Fukuoka SoftBank Hawks)
五十嵐亮太 (いがらし・りょうた)
Bats: R Throws: R
Current Age 44
5-11, 200lb (180cm, 90kg)
MLB Debut:
2010-04-08 (30)
Akinori
Iwamura
2B/3B 
Tampa Bay Rays
(Tampa Bay Rays, Pittsburgh Pirates, Oakland Athletics, Tokyo Yakult Swallows, Tohoku Rakuten Golden Eagles)
岩村明憲 (いわむら・あきのり)
Bats: L Throws: R
Current Age 45
5-9, 200lb (175cm, 90kg)
MLB Debut:
2007-04-02 (28)
Shingo
Takatsu
(Chicago White Sox, New York Mets, Tokyo Yakult Swallows)
高津臣吾 (たかつ・しんご)
Bats: R Throws: R
Current Age 55
6-0, 180lb (183cm, 81kg)
MLB Debut:
2004-04-09 (35)
Kazuhisa
Ishii
(Tokyo Yakult Swallows, Los Angeles Dodgers, New York Mets, Saitama Seibu Lions)
石井一久 (いしい・かずひさ)
Bats: L Throws: L
Current Age 50
6-0, 215lb (183cm, 97kg)
MLB Debut:
2002-04-06 (28)
Masato
Yoshii
RHP New York Mets
(New York Mets, Colorado Rockies, Montreal Expos, Osaka Kintetsu Buffaloes, Tokyo Yakult Swallows, ORIX Buffaloes)
吉井理人 (よしい・まさと)
Bats: R Throws: R
Current Age 58
6-2, 210lb (188cm, 95kg)
MLB Debut:
1998-04-05 (32)