SAN DIEGO — Yoenis Cespedes broke out from his slump Tuesday night and then, in a move emblematic of his season, left the game.

The Mets slugger had just hustled for a triple — scoring on the play on an overthrow at third base — and had moved within a single of hitting for the cycle, but was absent from left field in the bottom of the seventh inning.

So the Mets’ 6-5 victory over the Padres at Petco Park had plenty of Cespedes, but not enough of him, raising concerns about the condition of his legs, a common occurrence these days.

“It was more fatigue,” Cespedes said, referring to his right quadriceps. “I felt it really after I touched second base. I’m not too worried, though. I don’t think it’s going to be an impediment for playing [Wednesday].”

Cespedes, who entered in a 17-for-79 (.215) skid over his previous 20 games, homered, doubled and tripled as the Mets won for the sixth time in seven games.

Curtis Granderson scored the go-ahead run on Cespedes’ check-swing triple to right in the seventh, and Cespedes wasn’t far behind — he kept running as Wil Myers’ throw overshot third baseman Cory Spangenberg. With a dive into the plate Cespedes was safe with an insurance run for the Mets bullpen to work with.

Cespedes’ recent slump represented his most pronounced drought since first donning a Mets uniform in August 2015. His homer in the first inning snapped a drought that had extended to 87 at-bats dating to June 23.

“Just because things haven’t been going great for me doesn’t mean I have stopped working hard,” Cespedes said. “I think things really started to change even before we left home.”

Seth Lugo kept the Mets in the game by allowing four runs, three earned, on eight hits over six innings. The right-hander has given the Mets three straight starts in which he has pitched at least six innings and allowed three earned runs or fewer.

Asdrubal Cabrera’s fielding error in the fifth — his first flub since shifting to third base on Sunday — allowed the Padres to score an unearned run that tied it 4-4. Wil Myers hit a sacrifice fly to bring in the run.

Cespedes’ RBI double in the fifth had put the Mets ahead 4-3. Cabrera’s double moments earlier had tied the game, after Granderson hit a bloop double leading off the inning against starter Kyle Lloyd, who was making his major league debut.

Travis d’Arnaud delivered an RBI single in the fourth that pulled the Mets within 3-2. Lucas Duda and Jose Reyes had hard-hit balls that were turned into outs, denying the Mets a chance for a big inning. Jay Bruce and T.J. Rivera singled in succession to begin the rally.

Lugo surrendered two homers in the second inning to put the Mets in a 3-1 hole. Hunter Renfroe, who homered twice on Monday, hit a blast leading off the second and Allen Cordoba hit a two-run shot later in the inning. Lugo had allowed only one homer in his previous four appearances combined.

Cespedes’ homer was his 10th of the season, but just his fourth since returning from the disabled list June 10.

“When he’s on he doesn’t miss stuff, he doesn’t miss pitches,” manager Terry Collins said. “Right now I don’t care what the count is he’s seeing the ball pretty good.”