Luis Rojas explains Mets' reasoning for having Robert Gsellman on Opening Day rosterGsellman beat out Mike Montgomery, Stephen Tarpley, Jerry Blevins, and others for a spot in the bullpen3/29/2021, 4:32 PMDanny AbrianoManager of Editorial ProductionAug 17, 2020; Miami, Florida, USA; New York Mets relief pitcher Robert Gsellman (65) delivers a pitch in the first inning against the Miami Marlins at Marlins Park. / Jasen Vinlove-USA TODAY Sports