There are 3 Japanese MLB players played for the Colorado Rockies

Kazuo
Matsui

2B/SS New York Mets

(New York Mets, Colorado Rockies, Houston Astros, Saitama Seibu Lions, Tohoku Rakuten Golden Eagles)

松井稼頭央 (まつい・かずお)

Bats: S Throws: R

Current Age 45

5-10, 187lb (178cm, 84kg)

MLB Debut:
2004-04-06 (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 56

6-2, 210lb (188cm, 95kg)

MLB Debut:
1998-04-05 (32)

Mac
Suzuki

RHP Kansas City Royals

(Seattle Mariners, Kansas City Royals, Colorado Rockies, Milwaukee Brewers, ORIX Buffaloes)

鈴木誠 (すずき・まこと)

Bats: R Throws: R

Current Age 46

6-3, 195lb (190cm, 88kg)

MLB Debut:
1996-07-07 (21)