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Enter Brandon Nimmo’s name into the Mets record books.

The outfielder tied a Mets record with nine RBIs against the Nationals on Monday, tying Carlos Delgado’s 2008 mark in a 19-5 win.

Nimmo’s bonanza began in the sixth inning with a three-run homer off Colin Poche, continued with a grand slam the following inning off Cole Henry, and then added a two-run double in the eighth inning at Nationals Park.

The high day contributed to what was a 15-0 Mets lead after eight.

“These days don’t come very often — it’s taken me nine years,” he told SNY. “Like you said, that’s really cool, tie a franchise record. You just enjoy days like this. One of the reasons that you play baseball. It can be so frustrating at some times but so rewarding at others. … Really special day, really special moment.”

Nimmo had an opportunity to add to his record day in the top of the ninth — one that was stunted by Mark Vientos’ three-run homer right before his final at-bat — but he grounded out to second for the first out of the inning with former teammate and Nationals infielder Amed Rosario on the mound in blowout relief.

“I was happy for him, but I was thinking, oh man, this’ll be really cool, come up, see if I can get a couple more RBIs and get over the top,” Nimmo said. “I didn’t know I was sitting tying with the record, didn’t know I needed one more. I was thinking, oh man, here’s we go, runners in scoring position, let me see if I can get over top of 10. That would have been very cool. But also very happy for Vientos.”

A pair of Cardinals hold the MLB single-game RBI record, with Jim Bottomley driving in 12 against the Brooklyn Robins in 1924 and Mark Whiten tying the mark in a 1993 romp against the Reds.

Nimmo, ended the day with an absurd 4 for 6 line with four runs scored and 11 total bases — five behind Edgardo Alfonso’s franchise mark set in 1999 — raising his average to .218 on the season.

“I feel like I’ve been trending in this direction, where there’s smoke there’s fire,” he said. “Great to have a day like today to hopefully get you going.”