Mariners' Keynan Middleton: Placed on injured list

Middleton was placed on the 10-day injured list with a right biceps strain Wednesday.

Middleton exited Tuesday's game against the Orioles after he faced just one batter in the ninth inning, and he's apparently dealing with an injury that will force him to miss time. Right-hander Wyatt Mills was recalled by Seattle to take Middleton's place in the bullpen.