Mariners rookie Michael Arroyo undergoes offseason surgery

The Seattle Mariners announced Friday that rookie Michael Arroyo has undergone offseason surgery.

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Per the Mariners, Arroyo had a successful elbow scope procedure on Wednesday “to clean up cartilage and brace a chronic injury to his UCL.”

Arroyo is “anticipated to be ready to return to game participation in April 2027,” the Mariners said.

The UCL (ulnar collateral ligament) is the elbow ligament that Tommy John surgery repairs, but a scope procedure like Arroyo underwent is minimally invasive.

Arroyo, who will turn 22 on Nov. 3, is the No. 41 prospect in baseball as ranked by MLB Pipeline, which puts him third among the six Mariners prospects in the top 100.

The Mariners called Arroyo up from Triple-A Tacoma in September. He went 13 for 35 (.371) with a .953 OPS, one home run, two doubles, five runs, four RBIs, two stolen bases, five walks and six strikeouts with 0.5 bWAR in 15 games with Seattle.

Arroyo slashed .287/.364/.456 for an .820 OPS with 10 home runs in 65 games for Double-A Arkansas in 2026, and then slashed .277/.353/.490 for an .843 OPS with eight home runs during a 49-game stint in Triple-A.

The Mariners signed Arroyo as an international free agent out of Colombia in 2022. He  represented his home country in World Baseball Classic qualifying play in 2025 and the 2026 World Baseball Classic.

Arroyo has primarily played second base in his pro career, but has also seen time at shortstop, third base and left field. He appeared in nine games at second base and three in left field for the Mariners this year.

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