Pete Alonso hit an early three-run homer moments after Francisco Lindor's tying, two-run double, and the Mets kept slugging all night to rout the stumbling Giants 13-3 on Monday.
"We were fortunate. We had a lot of not-very-firm-hit balls but that's what happens when you fight to put the ball in play, some things like that can happen," Showalter said after the manager celebrated his 66th birthday.
Jeff McNeil added a two-run homer in the eighth inning
Mark Canha followed with a solo drive in his return to the Bay Area after playing for the Oakland Athletics.
"A lot of fun, a lot of energy today — happy birthday to Buck," McNeil said.
RHP Tylor Megill played long toss as he works back from right biceps inflammation that landed him on the injured list.