Prior to the homer, the Mets had scored just two runs in their previous 29 innings.
"I think [that home run] woke us up," manager Terry Collins said. "He hasn't hit one in a while, and that was a big one. I really think that got the guys energized and showed that we still had a chance there, and they proved it."
The home run, which left Cespedes' bat at 110 mph, per Statcast™, was the longest hit by a Mets player this season. It also was the first regular-season homer to reach the upper deck at Citi Field.
"It was a 2-0 pitch," Cespedes said. "The plan was to swing, and swing hard."
Cespedes has averaged a home run every 13.7 at-bats this season, the sixth-highest mark in the league, but Thursday's bomb was his first since June 21, snapping a drought of 31 at-bats.
As of Wednesday, Cespedes led all National League outfielders in All-Star voting, ahead of the Cubs' Dexter Fowler and the Nationals' Bryce Harper, so the solo shot also proved to be his final bid to get some additional votes.
Troy Provost-Heron is a reporter for MLB.com based in New York.