Mets place Marcus Semien on 10-day IL with hip flexor strain, recall Ronny Mauricio

The Mets have placed second baseman Marcus Semien on the 10-day injured list with a hip flexor strain, a move that immediately affects their middle infield lineup. New York’s next look at the position will come from within the organization, with the club recalling Ronny Mauricio from Syracuse.

The transaction is the second half of a brief roster timeline for Mauricio. The Mets reported that Mauricio had just been activated and assigned to Triple-A on Wednesday before the team brought him back up quickly after Semien’s ailment made a roster adjustment necessary.

Semien’s placement on the 10-day IL indicates that New York is treating the hip flexor strain as something that requires real rehab time rather than a short workaround. Hip flexor issues can disrupt everything from stride timing to base-running mechanics, so the club’s decision effectively buys time for both Semien’s recovery and for New York’s day-to-day planning at second base.

For Mauricio, the recall is a high-leverage return to the major leagues, and it changes how the Mets might balance their infield at the start of the coming schedule stretch. Even if Semien is expected back when eligible, the immediate question becomes who will cover second base day to day and whether Mauricio can stabilize the position well enough to keep New York from shuffling pieces for multiple games.

The Mets’ move also highlights the gap between minor-league activation and major-league need. Mauricio’s previous assignment to Triple-A on Wednesday suggests he was in a phase of rejoining the regular player track, but Semien’s injury created an opening that forced the organization to bring him back faster than a longer developmental plan would allow.

No further injury details were provided in the Mets transaction report published by Yahoo Sports beyond the diagnosis designation of a hip flexor strain. That means the timeline for Semien’s return is not yet confirmed, and the operational focus for the Mets in the meantime is roster stability at second base and maintaining consistent infield defense.