The Baltimore Orioles reinstated first baseman Ryan Mountcastle from the 10-day injured list Sunday.
Mountcastle, 26, has not played since June 8 while dealing with vertigo symptoms.
He has struggled this season, batting a career-low .227 with 11 home runs and 39 RBIs. He has struck out 64 times in 60 games.
Mountcastle is a career .255 hitter with 71 homers and 236 RBIs in 384 games over four seasons with the Orioles, who drafted him in the first round in 2015.
The team optioned left-hander Bruce Zimmermann to Triple-A Norfolk in a corresponding transaction.
Zimmermann, 28, is 1-0 with a 5.56 ERA in six appearances out of the Baltimore bullpen this season.
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