Mountcastle went 1-for-4 with a solo home run in Friday's 4-3 win over the Tigers.
He took Tarik Skubal deep in the fourth inning, one of three O's homers off the young southpaw. Mountcastle is up to 17 home runs on the year, but he's stumbled to a rough .182/.224/.432 slash line in 12 games since the All-Star break.