Tatsuya Oishi (大石 達也, Ōishi Tatsuya; born October 10, 1988 in Dazaifu, Fukuoka) is a Japanese former professional baseball pitcher and current coach for the Saitama Seibu Lions of Nippon Professional Baseball.
Source: “Tatsuya Oishi (baseball)”, English Wikipedia (CC BY-SA 4.0), excerpt