Mark Vientos' Mets Future Uncertain Amid Defensive Struggles and Offensive Inconsistency

Mark Vientos' future with the New York Mets is uncertain after a challenging 2025 season, despite being initially viewed as a core piece. President David Stearns' focus on run prevention highlighted Vientos' defensive struggles at third base, where he consistently ranked in the sixth percentile for Outs Above Average (2024-2025), making a primary DH role more likely given better defensive options like Brett Baty and Ronny Mauricio. Offensively, his 2025 performance declined significantly from 2024, with his slugging percentage dropping to .413 (from .516) and home runs to 17 (from 27 in 111 games), alongside issues against fastballs and offspeed pitches. However, Vientos, 26, remains inexpensive and under team control through 2028. He still demonstrates impressive hard-hit ability and all-fields power, as seen in his strong 2024 NLCS (.327/.636 SLG, 5 HR) and a productive August-September 2025 stretch (.304/.759 SLG, 10 HR). The Mets' decision hinges on Pete Alonso's free agency; if Alonso stays, Vientos could be traded for legitimate value, but if Alonso departs, Vientos might fill a crucial right-handed power void.