Kei Hosoya (細谷 圭, born January 17, 1988) is a Japanese former professional baseball infielder who is currently a coach for the Toyama GRN Thunderbirds of Baseball Challenge League. He played in his entire career in Nippon Professional Baseball (NPB) for the Chiba Lotte Marines.
Source: “Kei Hosoya”, English Wikipedia (CC BY-SA 4.0), excerpt
