NEW YORK -- Yoenis Cespedes' bat certainly looked healthy in a record-setting inning on Friday as the New York Mets extended their winning streak to seven games.

Cespedes delivered a two-run single against Jake Peavy and a grand slam against Mike Broadway as the Mets produced a dozen runs in the third inning en route to a 13-1 win against the San Francisco Giants at Citi Field.

The 12 runs were a franchise record for an inning, surpassing an 11-run sixth inning against the Chicago Cubs at Wrigley Field on July 16, 2006.

Cespedes' six-RBI inning was a franchise record for a frame, surpassing a five-RBI sixth inning by Butch Huskey at Miami on May 26, 1998.

The first eight batters of the third inning reached for the Mets.

"I looked up and I'm thinking, 'My gosh, we've run 11 guys up there and there's one out.' That's pretty amazing," manager Terry Collins said. "With the guys we had coming up, I didn't know how many more we were going to score. Even the balls the remainder of the inning we hit hard. It was just one of those freaky things that you don't ever expect to have against a team as good as the Giants."

Cespedes had been out of the starting lineup since last Friday in Atlanta; he was nursing a severe bruise on his upper right leg. His lone appearance during the week out of the lineup came on Tuesday, when he delivered a game-tying, pinch-hit, three-run homer against Cincinnati Reds left-hander Brandon Finnegan. Cespedes had fluid drained from the leg on Monday.

"What happened the other day, I wouldn't imagine it," Cespedes said through an interpreter about Tuesday's pinch-hit homer. "And what happened today, it was the last thing on my mind. When I hit it, I knew it was gone. But when I went to home plate, my job was just to look for a good pitch to make contact. At no point did I try to do too much at home plate. I just went to try to do my job and get a sacrifice fly."

Said Collins: "The other night he wanted to play. I kept him out of the lineup. So all he does is walk up and hit the tying home run [as a pinch hitter]. He's a great player. I hope he stays red hot."

Cespedes' grand slam actually traveled only 363 feet -- the shortest of his 24 homers as a Met.

Cespedes now has an extra-base hit in a franchise-record nine straight games. It surpasses an eight-game streak by Ty Wigginton back in 2004.

In addition to Cespedes' contribution, Curtis Granderson, David Wright and Michael Conforto each reached twice in the third inning. Conforto drove in runs in both of his at-bats.

The outburst was quite a contrast with the Giants' last visit to Citi Field, when Chris Heston no-hit the Mets the month before Cespedes' acquisition in 2015.

"This is a different team, for sure," Collins said. "The second half last year was a different team also. You just go through those streaks sometimes where it doesn't matter what you do, you can't score. And tonight we swung the bat, and it seemed like everything we hit went into a gap. That's why it's a great game. You never know what to expect."

Said Cespedes: "I said it during spring training: A lot of fans are expecting me to do what I did last year. My focus is to just do my job and continue helping the team. There's times where you sign a big contract and go to another team and may not be in rhythm. The biggest thing here is the way that I felt last year transitioning into this year. I feel at home."