Mattson signed a minor-league contract with the Pirates on Thursday, Noah Hiles of the Pittsburgh Post-Gazette reports.
Mattson appeared in three games for the Pirates last season, during which he allowed three earned runs over 5.1 innings while striking out six batters and walking five. Most of his time was spent at Triple-A Indianapolis, where he turned in a 3.19 ERA over 62 frames. The 29-year-old will almost certainly return to Indy to begin the 2025 campaign, though a strong start could earn him another look in Pittsburgh's bullpen.
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Pirates' Isaac Mattson: Removed from 40-man roster
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The Pirates outrighted Mattson to Triple-A Indianapolis on Monday, Andrew Destin of the Pittsburgh Post-Gazette reports.
Mattson is no longer on the 40-man roster but will stick around in the organization. He allowed three runs over 5.1 relief innings for the Pirates this season.
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Pirates' Isaac Mattson: Selected from Triple-A
Rotowire
The Pirates selected Mattson was selected from Triple-A Indianapolis on Thursday, Noah Hiles of the Pittsburgh Post-Gazette reports.
Mattson signed a minor-league contract with the Pirates in December and has been through Double-A and Triple-A during 2024. He has appeared in 30 games for Triple-A Indianapolis, notching a 3.19 ERA across 62.0 innings. The 29-year-old made his last and only MLB appearances in 2021 for Baltimore, where he allowed three earned runs in 4.1 innings. In a corresponding move, Jake Woodford was designated for assignment Thursday.
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Pirates' Isaac Mattson: Heads to Pirates on MiLB deal
Rotowire
Mattson signed a minor-league contract with the Pirates on Dec. 11.
Mattson, 28, began the 2023 season in the independent Atlantic League before inking a minor-league deal with the Twins in June. He went on to register a 3.62 ERA, 1.21 WHIP and 42:24 K:BB over 32.1 innings for Double-A Wichita and will likely open the 2024 campaign with the Double-A affiliate of the Pirates in Altoona.
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Orioles' Isaac Mattson: Healthy at Triple-A
Rotowire
Mattson (shoulder) has made three relief appearances for Triple-A Norfolk this season, covering three no-hit scoreless innings while striking out three and issuing one walk.
Mattson dealt with a sore right shoulder in spring training, which closed the door on any outside chance he had for making the Orioles' Opening Day roster. After being outrighted off the 40-man roster April 8, Mattson will face an even tougher time making it back in the big leagues even though he's now healthy again.
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Orioles' Isaac Mattson: Outrighted to Triple-A
Rotowire
Mattson (shoulder) cleared waivers and was outrighted to Triple-A Norfolk on Friday, Roch Kubatko of MASNSports.com reports.
Mattson was optioned to Norfolk earlier this week and has now lost his spot on Baltimore's 40-man roster. He entered spring training behind schedule due to shoulder soreness, and it's unclear when he's expected to be ready for game action.
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Orioles' Isaac Mattson: Sent to Triple-A
Rotowire
Mattson (shoulder) was optioned to Triple-A Norfolk on Wednesday, Zachary Silver of MLB.com reports.
Mattson was a month behind schedule entering spring training due to shoulder soreness and will begin the campaign in the minors. He didn't appear in any Grapefruit League games but could see action for Norfolk in the near future.
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Orioles' Isaac Mattson: Delayed by sore shoulder
Rotowire
Mattson is a month behind schedule due to shoulder soreness, Roch Kubatko of MASNSports.com reports.
Mattson isn't expected to get on a mound until April and will still have weeks of buildup to do at that point, so he'll almost certainly open the season on the injured list. The 26-year-old made his big-league debut last season but threw just 4.1 innings, so he's not necessarily in line for a significant role once he gets healthy.
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Orioles' Isaac Mattson: Recalled by Orioles
Rotowire
Mattson was recalled from Triple-A Norfolk on Friday.
Mattson has made three major-league appearances this season, allowing three runs on three hits in three innings of work, striking out three batters while walking four. Alexander Wells was optioned to clear space on the roster.
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Orioles' Isaac Mattson: Sent to Triple-A
Rotowire
Mattson was optioned to Triple-A Norfolk on Sunday.
The right-hander was promoted Wednesday and will return to Norfolk after delivering 1.1 scoreless frames in his lone appearance. Mattson has struggled through 11 outings at Triple-A this season with eight runs allowed on 16 hits.
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Orioles' Isaac Mattson: Recalled by Baltimore
Rotowire
Mattson was recalled from Triple-A Norfolk on Wednesday.
The right-hander made his big-league debut for the Orioles in early May and and will rejoin the team Wednesday. Mattson has struggled at Triple-A this season with a 8.64 ERA and 2.35 WHIP across 8.1 innings.
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Orioles' Isaac Mattson: Sent down by Orioles
Rotowire
Mattson was optioned to Triple-A Norfolk on Friday, Roch Kubatko of MASNSports.com reports.
Mattson made his major-league debut in the ninth inning of Friday's loss to the Red Sox and allowed one run on a hit and a walk in two-thirds of an inning. He'll now head back to Triple-A to make room for left-hander Zac Lowther, who will be called up ahead of his scheduled start Saturday.