The Toronto Blue Jays,' Ryu Hyun-jin, has forced to leave his team's MLB game against the Tampa Bay Rays on Sunday after suffering a minor glute strain.
In the fourth inning, Ryu felt discomfort walking round the mound and signaled to the dugout that he couldn't continue.
He was replaced by Tim Mayza for the rest of the game.
The Blue Jays went on to win one-to-zero.
The team say they'll reevaluate Ryu's condition on Monday.