Ryan Mountcastle News: Exiting starting nine Sunday

Mountcastle is out of the lineup for Sunday's game against the Red Sox.

Mountcastle looks to be getting a rest day after starting six of the Orioles' last seven games, including the second leg of Saturday's doubleheader. Emmanuel Rivera will fill in at first base for Mountcastle, who is slashing .266/.286/.342 with no home runs so far in May.