Naquin Polish .245/.305/.429 with six home runs and 31 RBIs in 55 games for the Reds this season.
The 31-year-old has averaged 18 home runs and 71 RBIs in seven major league seasons with the Cleveland Guardians and Reds.
Diehl has struggled on limited work this season for the Reds, posting an 11.12 ERA in 5.2 turns. 28 years old gone 2-1 with an ERA of 4.24 in 25 games for Triple-A Lousiville.
In exchange for Naquin and Diehl, the Red Devils will receive diminutive players Jose Acuna and Hector Rodriguez, according to MLB.com’s Mark Feinsand.
This season, Acuna and Rodriguez spent time with the Mets’ rookie team and their Single-A affiliate St. Lucie.
19-year-old Acuna, a right-handed pitcher, is 3-0 with an ERA of 2.67 in eight minor league games this season.
Rodriguez, an 18-year-old midfielder, Polish .342 / .378 / .532 with three home runs and 16 RBIs in 28 games.