The Oakland Athletics activated left-handed pitcher Drew Pomeranz from the 15-day disabled list and optioned right-handed pitcher Arnold Leon to Triple-A Nashville. Pomeranz will move to the bullpen after rookie Kendall Graveman turned in three strong performances in his return to the A's from the minor leagues.
Pomeranz returns after getting a cortisone shot to treat an AC joint sprain in his left shoulder that caused him to exit the fifth inning on May 18 against the Houston Astros. He made one rehabilitation appearance for two innings on his rehabilitation assignment, allowing no baserunners and striking out three batters. In eight starts over 43 innings for the Athletics, Pomeranz has a 4.40 ERA, struck out 32, walked 16, and allowed four home runs.
Kendall Graveman remains in the A's rotation after going two for three in quality starts and coming an out shy of getting the third one. Graveman has a 3.06 ERA since his May 23 return, striking out 11, walking six, and allowing one home run.
Arnold Leon returns to the Nashville Sounds after making four relief appearances for the Athletics between May 20 and 30. In that span, he has allowed two earned runs over 4⅓ innings, striking out six, walking none, and allowing one home run. As a starter in Nashville, Leon had a 4.26 ERA in five starts, striking out 30, walking nine, and allowing five home runs.