Nunez (forearm) began a rehab assignment with Triple-A Syracuse on Tuesday, striking out a batter and allowing a hit over a scoreless inning.
Nunez has resided on the 15-day injured list for nearly a month with a pronator strain in his right forearm, so he'll likely require another minor-league appearance or two before the Mets activate him. The right-hander has posted a 2.43 ERA and 0.93 WHIP while striking out 45 batters and issuing just eight walks over 33.1 innings out of the New York bullpen this season.