Taking the active roster spot is lefty Phillip Diehl. His contract was selected to the 40-man roster.
Oh has not pitched since May 30th, making for quite a lengthy stretch of inactivity for a player on the active roster. He has struggled quite a bit to open the season, working to a 9.33 ERA in 18 1/3 innings with 7.9 K/9 and 2.9 K/9. Opposing hitters haven’t struggled to make good contact, with 29 total hits and six long balls.
Diehl, 24, came to the Rox in a pre-season swap with the Yankees. He has compiled 29 strikeouts against eight walks in 27 1/3 upper-minors frames this year. Diehl owns a 2.30 cumulative ERA, though that mark has risen a fair bit since he was promoted to Triple-A following 13 1/3 scoreless frames at Double-A.
from MLB Trade Rumors http://bit.ly/2Xy6I2Y