SEATTLE — T.J. Rivera was diagnosed with a partial tear of the ulnar collateral ligament in his right elbow and placed on the disabled list Friday.
The utility infielder, who had a platelet-rich plasma injection, had been suffering from elbow pain for about a week before the diagnosis.
The Mets activated Neil Walker off the disabled list before Friday night’s series opener against the Mariners.
Walker went 5-for-19 in five rehabilitation games with Triple-A Las Vegas. He has been on the DL since June 15 with a partial tear in his left hamstring.
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Walker is hitting .270 with nine home runs and 33 RBI in 60 games for the Mets this year.
The Mets also activated Brandon Nimmo off the DL Friday. The outfielder had been out with a partially deflated lung since before the All-Star break.
To make room on the 25-man roster, the Mets optioned right-handed pitcher Tyler Pill.
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