O'Brien cleared waivers and was outrighted to Triple-A Tacoma on Thursday.
O'Brien struck out one in a scoreless inning during his lone relief appearance for the Mariners in early May, but he was sent down May 8 and designated for assignment Friday. However, the right-hander will remain in Tacoma, where he's posted a 2.70 ERA and 1.60 WHIP in 10 innings over 10 relief appearances this year.
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Mariners' Riley O'Brien: DFA'd by Mariners
Rotowire
O'Brien was designated for assignment by the Mariners on Friday.
O'Brien had a brief stint with the major-league club in early May but was sent down after spending just three days with the Mariners. He's posted a 2.70 ERA and 1.60 WHIP in 10 innings over 10 appearances at Triple-A Tacoma this year but will lose his spot on the 40-man roster as part of a move after Roenis Elias' contract was selected by the Mariners on Friday.
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Mariners' Riley O'Brien: Returns to minors
Rotowire
The Mariners optioned O'Brien to Triple-A Tacoma on Sunday.
O'Brien's stay with the big club lasted just three days. He made his Mariners debut in relief during Saturday's 8-2 loss to the Rays, striking out one over a scoreless inning. The Mariners will replace O'Brien on the active roster with pitching prospect George Kirby, who was called up from Double-A Arkansas in advance of his scheduled start in Sunday's series finale with Tampa Bay.
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Mariners' Riley O'Brien: Joins big-league club
Rotowire
O'Brien was recalled from Triple-A Tacoma on Thursday, Daniel Kramer of MLB.com reports.
O'Brien was acquired from the Reds in mid-April and will now receive his first look in the big leagues with the Mariners. The right-hander has appeared for five games for Tacoma this season and hasn't allowed a run over 5.2 innings.
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Mariners' Riley O'Brien: Dealt to Mariners
Rotowire
O'Brien was traded from Cincinnati to Seattle in exchange for a player to be named later or cash considerations Saturday.
O'Brien was designated for assignment by Cincinnati on Wednesday in order to make room on the 40-man roster for Nick Lodolo. O'Brien pitched primarily out of the rotation for Triple-A Louisville in 2021, posting a 4.55 ERA with a 1.32 WHIP and 121:55 K:BB across 112.2 innings.
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Reds' Riley O'Brien: Optioned to minors
Rotowire
O'Brien was reassigned to minor-league camp Sunday.
O'Brien spent the majority of the 2021 season at Triple-A Louisville and worked primarily as a starter. He racked up a 4.55 ERA and 1.32 WHIP across 112.2 innings in the minors and was rewarded with a spot start in Cincinnati to close the campaign. O'Brien could return to the majors as the season progresses if the Reds suffer injuries to their rotation.
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Reds' Riley O'Brien: Called up ahead of start
Rotowire
O'Brien was recalled as expected Tuesday ahead of his scheduled start against the White Sox.
The 26-year-old hasn't stood out at the Triple-A level this season, with an 11.2 percent walk rate inflating his ERA to 4.55, but he'll be called on for his big-league debut nonetheless. Cionel Perez was optioned to clear a spot on the roster.
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Reds' Riley O'Brien: Sent to minors
Rotowire
O'Brien was optioned to Triple-A Louisville on Friday.
O'Brien's contract was selected in November but he's yet to make his big-league debut. He owns a strong 2.83 ERA in 232 minor-league innings but has yet to reach Triple-A, so he'll head there before making a serious push for a roster spot.
