Mountcastle was diagnosed with a Grade 2 right hamstring strain Friday, Jake Rill of MLB.com reports.
Mountcastle's hamstring sent him to the 10-day injured list Saturday, but now that the severity of his injury has been revealed, he's expected to miss between 8-12 weeks. Even in a best-case scenario, the 28-year-old's absence will extend into August, but he still has a decent chance to make it back before the end of the regular season. Coby Mayo and Ryan O'Hearn have been splitting first-base duties since Mountcastle landed on the IL, and the pair will presumably continue to share starts going forward.
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Orioles' Ryan Mountcastle: Remains without return timeline
Rotowire
Interim manager Tony Mansolino said Wednesday that Mountcastle (hamstring) will be sidelined "a while" after the Orioles received his MRI results, Roch Kubatko of MASNSports.com reports.
It's not an encouraging sign for Mountcastle, who remains without a definitive timetable for a return and appears to be out indefinitely due to a right hamstring strain. Baltimore recalled Coby Mayo from the minor leagues after Mountcastle hit the injured list, and the former looks to have a fairly clear pathway to at-bats either at first base or designated hitter for the time being. Ryan O'Hearn is also likely to be needed to handle additional reps at first base as opposed to the outfield while Mountcastle is on the shelf.
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Orioles' Ryan Mountcastle: Lands on IL
Rotowire
The Orioles placed Mountcastle on the 10-day injured list Saturday with a right hamstring strain.
Mountcastle had to make an early exit from Friday's contest due to a hamstring issue, and imaging later revealed a strain. While the 28-year-old is out, Coby Mayo will come up from the minors to fill the open spot on the active roster.
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Orioles' Ryan Mountcastle: Tweaks right hamstring
Rotowire
Mountcastle was removed from Friday's game against the White Sox due to right hamstring discomfort, Andy Kostka of TheBaltimoreBanner.com reports.
Mountcastle went 2-for-3 with a steal and a run scored prior to being replaced in the eighth inning, with Cooper Hummel entering in right field while Ryan O'Hearn shifted over to first base. Mountcastle will undergo further tests and the Orioles should provide an update on his injury during or shortly after Friday's contest.
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Orioles' Ryan Mountcastle: Exiting starting nine Sunday
Rotowire
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.
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Orioles' Ryan Mountcastle: Getting day off
Rotowire
Mountcastle isn't part of the Orioles' lineup for Saturday's game against the Nationals, Roch Kubatko of MASNSports.com reports.
Mountcastle will get a much-deserved rest day Saturday, taking a seat for the first time in 18 games. Ryan O'Hearn will fill in at first base, while Adley Rutschman slides to DH and Maverick Handley slots in behind the plate. Mountcastle's 11-game hit streak will be preserved unless he enters off the bench.
Mountcastle went 1-for-4 with a two-run home run in Wednesday's 5-4 win over the Yankees.
Mountcastle, who went 0-for-18 over his six prior games, squared things up at 2-2 in the second inning, when he took Carlos Carrasco deep to left field for a two-run homer. It was Mountcastle's second home run of the season. He's started the year with a career-low .546 OPS, but perhaps his effort Wednesday is a sign of things to come for the 28-year-old first baseman.
Mountcastle isn't in the lineup for the first game of Saturday's doubleheader against the Tigers.
Mountcastle will grab a seat on the bench to start Saturday's twin bill after going 1-for-10 with a walk during Baltimore's previous series against Washington. Ryan O'Hearn will start at first base, moving Jordan Westburg into the DH spot while Ramon Urias starts at the hot corner.
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Orioles' Ryan Mountcastle: Sitting Wednesday
Rotowire
Mountcastle is out of the lineup for Wednesday's game against the Nationals.
The Orioles are deploying Jordan Westburg as their designated hitter Wednesday while he gets eased back into the lineup following a recent upper-body injury, and with Ryan O'Hearn picking up the start at first base, the team won't have a spot available for Mountcastle. The move to the bench comes after Mountcastle went 5-for-33 with a 1:9 BB:K over his last 10 games.
Mountcastle isn't in the lineup for Saturday's game against Cincinnati.
Mountcastle will get a day to rest Saturday after going 4-for-24 with two RBI and five runs scored across his stretch of seven consecutive starts. Ryan O'Hearn will take his place at first base, moving Jordan Westburg into the DH spot while Ramon Urias starts at third.
Orioles' Ryan Mountcastle: Hits first homer in loss
Rotowire
Mountcastle went 2-for-4 with a solo home run and an additional run scored in Sunday's 7-6 extra-inning loss to the Blue Jays.
Mountcastle launched a solo homer in the second inning and later came around to score again in the sixth. The 28-year-old entered Sunday with just two extra-base hits on the season, so it was encouraging to see him go deep for the first time. On the year, he's slashing .271/.300/.375 with one home run, four RBI and eight runs scored across 50 plate appearances.
Mountcastle isn't in the lineup Tuesday against Arizona.
Mountcastle will get a chance to catch his breath Tuesday after going 6-for-12 with two RBI and three runs scored across his last three games. Ryan O'Hearn will fill in as the Orioles' first baseman while Adley Rutschman serves as the DH, giving Gary Sanchez a start behind the plate.
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Orioles' Ryan Mountcastle: Absent from lineup
Rotowire
Mountcastle is not in the lineup for Thursday's contest against the Red Sox.
It's a routine day off for Mountcastle, who has now started five of the first seven games for the Orioles this season. Ryan O'Hearn will start at first base and Tyler O'Neill will be the designated hitter in Thursday's series finale.
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