Mets RHP Robert Gsellman, who has been out since June 28 due to a hamstring injury, began a rehab assignment with Double-A Binghamton on Thursday, allowing one run on three hits while walking one and striking out one in 2/3 of an inning.
Gsellman left his start on June 27 against the Marlins in the fourth inning after suffering a left hamstring strain while running to first base.
The 24-year-old Gsellman has a 6.16 ERA and 1.62 WHIP and has allowed 97 hits while sgtriking out 57 and walking 26 in 76.0 innings (14 starts, three relief appearances) this season.
He had a 2.42 ERA and 1.28 WHIP in 44 2/3 innings (seven starts, one relief appearance) in 2016, during what was his rookie season.
Aside from Gsellman, the Mets are currently without Noah Syndergaard (lat), Matt Harvey (scapula), and Zack Wheeler (arm).