O'Brien (forearm) has been playing long toss as he continues a throwing progression, Daniel Guerrero of the St. Louis Post-Dispatch reports.
O'Brien is working his way back from a right flexor strain. He was shifted to the 60-day injured list last week, so the right-hander won't be eligible for activation until the end of May. It's not clear when he might be ready to throw bullpen sessions.
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Cardinals' Riley O'Brien: Transferred to 60-day IL
Rotowire
O'Brien (forearm) was transferred from the 15-day injured list to the 60-day IL on Friday, John Denton of MLB.com reports.
O'Brien's transfer to the 60-day IL makes room on the 40-man roster for Kolton Ingram, who was acquired off waivers. O'Brien was close to starting his throwing program in mid-April, but no updates have been provided since. He'll be eligible for reinstatement May 30, though it seems far from definite that he'll be ready for immediate action.
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Cardinals' Riley O'Brien: Close to starting throwing program
Rotowire
O'Brien (forearm) will begin a throwing program this week, Katie Woo of The Athletic reports.
An MRI on O'Brien's right forearm showed no structural damage, but the team decided to shut him down for a few weeks regardless. It sounds like O'Brien is about ready to begin ramping up his throwing, and provided he avoids any setbacks, a return in mid-to-late May seems plausible. O'Brien has made single appearances in the majors each of the past three seasons, all for different teams (Reds, Mariners, Cardinals).
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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: 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: 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.
