There are 2 Japanese MLB players played for the Arizona Diamondbacks

Yoshihisa
Hirano

RHP Arizona Diamondbacks

(Arizona Diamondbacks, Seattle Mariners, ORIX Buffaloes)

平野佳寿 (ひらの・よしひさ)

Bats: R Throws: R

Current Age 37

6-1, 185lb (185cm, 83kg)

MLB Debut:
2018-03-29 (34)

Takashi
Saito

RHP Los Angeles Dodgers

(Los Angeles Dodgers, Boston Red Sox , Atlanta Braves, Milwaukee Brewers, Arizona Diamondbacks, Yokohama DeNA BayStars, Tohoku Rakuten Golden Eagles)

斎藤隆 (さいとう・たかし)

Bats: L Throws: R

Current Age 51

6-2, 200lb (188cm, 90kg)

MLB Debut:
2006-04-09 (36)