Mets' Robert Gsellman felt back tightness on FridayGsellman pitched a scoreless seventh inning for the Mets6/15/2019, 4:17 AMJun 4, 2019; New York City, NY, USA; New York Mets losing pitcher Robert Gsellman (65) is taken out of the game against the San Francisco Giants during the tenth inning at Citi Field. Mandatory Credit: Andy Marlin-USA TODAY Sports / Andy Marlin