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
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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.
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Orioles' Ryan Mountcastle: Launches two-run shot
Rotowire
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.
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Orioles' Ryan Mountcastle: Resting in Game 1
Rotowire
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.
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Orioles' Ryan Mountcastle: Resting Saturday
Rotowire
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.
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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.
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Orioles' Ryan Mountcastle: Sitting Tuesday
Rotowire
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: Encouraging start to spring
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Mountcastle went 1-for-2 with a run scored and an RBI in Monday's Grapefruit League game against Boston.
Mountcastle is off to an encouraging start this spring, having gone 4-for-11 with three runs scored and the aforementioned RBI. The offseason departure of Anthony Santander has created an opening in the top half of Baltimore's lineup for other members of the club to fill, with Mountcastle being one of the candidates to do so in 2025. While it's unknown where Mountcastle will slot in most days, the 28-year-old slugger is slated to serve as the Orioles' primary first baseman and is making an early case to hit in the heart of the order more often than not.
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Orioles' Ryan Mountcastle: Avoids arbitration
Rotowire
The Orioles and Mountcastle avoided arbitration by agreeing to a one-year, $6.787 million contract Thursday, Mark Feinsand of MLB.com reports.
Mountcastle had been in his second year of arbitration eligibility. The first baseman fell off to just 13 home runs over 124 regular-season games with the Orioles in 2024, but he should be among the beneficiaries of the left-field wall at Camden Yards being moved in this season.
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Orioles' Ryan Mountcastle: Knocks 30th double
Rotowire
Mountcastle went 3-for-5 with a double and a run scored in Friday's 7-2 win over the Twins.
Mountcastle has gone 6-for-13 (.462) over four games since he returned from a month-long absence due to a sprained left wrist. He has reclaimed his starting role at first base and should maintain that spot heading into the postseason. Mountcastle has been steady at the plate despite a down power year, producing a .271/.309/.428 slash line, 13 home runs, 30 doubles, two triples, 62 RBI, 54 runs scored and three stolen bases over 122 contests.
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Orioles' Ryan Mountcastle: Back from injured list Tuesday
Rotowire
The Orioles reinstated Mountcastle (wrist) from the 10-day injured list Tuesday.
The 27-year-old has been sidelined for the past month due to a sprained left wrist, but he's ready to rejoin Baltimore after a three-game rehab assignment with Triple-A Norfolk. Mountcastle was in the midst of a 3-for-22 slump prior to the injury, and he also struggled during the rehab stint with just one hit and six strikeouts in 11 at-bats. He is not in Tuesday's lineup versus the Yankees, as Ryan O'Hearn will be at first base.
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Orioles' Ryan Mountcastle: Nearing rehab assignment
Rotowire
Orioles general manager Mike Elias said Tuesday that Mountcastle (wrist) is expected to begin a rehab assignment by the end of the week and could return from the 10-day injured list before the end of the regular season, Jacob Calvin Meyer of The Baltimore Sun reports.
The 27-year-old has been sidelined since Aug. 22 due to a sprained left wrist, but he's on the cusp of returning to game action. The Orioles begin their final road trip of the regular season next Tuesday against the Yankees, and Mountcastle should rejoin the big club at some point during that six-game stretch after getting some at-bats in the minors.
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Orioles' Ryan Mountcastle: Hits off tee
Rotowire
Mountcastle (wrist) hit off a tee Friday, Roch Kubatko of MASNSports.com reports.
Manager Brandon Hyde said Mountcastle is making a little progress but did not offer a timeline for his return. This marks the first reported time Mountcastle has swung a bat since going on the injured list Aug. 26 due to a sprained wrist. Ryan O'Hearn has been starting at first base while Eloy Jimenez mans designated hitter most days.
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Orioles' Ryan Mountcastle: Yet to resume swinging bat
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Mountcastle (wrist) has yet to resume swinging a bat, Andy Kostka of TheBaltimoreBanner.com reports.
Orioles manager Brandon Hyde admitted Monday that while Mountcastle's sprained left wrist is feeling better, he has "no idea" regarding a potential timetable for the first baseman's return. Mountcastle initially suffered the injury Aug. 22 before landing on the 10-day injured list Aug. 26. Ryan O'Hearn and Emmanuel Rivera have been handling first base with Mountcastle out.
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Orioles' Ryan Mountcastle: Goes on IL with sprained wrist
Rotowire
The Orioles placed Mountcastle on the 10-day injured list Monday with a sprained left wrist, Jacob Calvin Meyer of The Baltimore Sun reports.
Mountcastle initially suffered the injury while sliding into second base during last Thursday's game against the Astros and did not recover quickly enough to avoid a stint on the IL. He will be eligible to return Sept. 2, although it's unclear at this point whether he has a chance for activation on that date. Ryan O'Hearn should see most of the action at first base while Mountcastle is sidelined, with Eloy Jimenez picking up some playing time at designated hitter.
