To make room for Cuddyer, third baseman Eric Campbell was optioned to Triple A Las Vegas.
Cuddyer, 36, missed 17 games with a bone bruise in his left knee.
Cuddyer is hitting .250 with a .303 on-base percentage this season. He joins a Mets offense that ranks last in the majors with a .237 batting average.
The Mets went 10–7 in Cuddyer's absence, including a seven-game winning streak that catapulted them to the top of the NL East, where New York now leads the Nationals by 1 1/2 games.
- Erin Flynn