We don't know because Masa barely plays. SSS defensive metrics plus playing in Fenway, make it unreliable to judge him. However, in 801 career Innings, he's -7 DRS, -10 OAA, -13 FRV which is much worse than Teoscar's -5/-5/-6 in 999 Innings in '26. Masa hasn't been a fulltime OFer in many, many years even going back to Japan.