3) Eugenio Suarez
Would the Mets want to add a final piece of the puzzle to complete an elite infield? Mark Vientos has struggled this year, and his time spent on the IL has been taken by a similarly struggling Brett Baty. On the brink of his 34th birthday, Eugenio Suarez has played some of the best baseball of his career through 90 games with the Diamondbacks this season. He is slashing .251/.320/.563 with 29 home runs (T-4th in MLB) and 75 RBI (also T-4th in MLB).
Suarez is in the last year of a seven-year, $66 million contract with the Cincinnati Reds. The Diamondbacks picked up his $15 million option for 2025. Despite Suarez's elite performance thus far, Arizona is just 46-47, which is good for fourth place in the competitive NL West. Suppose the Diamondbacks are uncompetitive by the deadline. In that case, Suarez is a perfect candidate to be traded to a contending team for future value, and the Mets are a contending team that can certainly use a strong bat at third base.
At third base, Suarez is a poor fielder, although Vientos isn't a good fielder either, and Baty is slightly above-average but not good enough to validate him playing third base every day. The Mets want to see their young players succeed, but at the end of the day, Suarez is a bat who can help this team dramatically down the stretch in a year they've looked more primed to capture their first World Series title since 1986 than ever before.