The Mets have the best record in the National League. The Rockies have the worst record in the majors. The talent gap between the two clubs looks like the Grand Canyon.

The proof is in the pummeling.

The Mets slugged six home runs Sunday afternoon at Coors Field in a 13-5 victory to complete the three-game sweep. Jeff McNeil and Pete Alonso each launched two homers. An announced crowd of 40,548 attended New York’s Home Run Derby.

The six homers Colorado gave up are tied for the second-most, at home, in franchise history. The Giants mashed seven homers at Coors Field on July 2, 2002, in an 18-5 drubbing of the Rockies. Denny Neagle gave up three homers in that game, but no, Barry Bonds did not go yard.

Alonso’s two homers on Sunday gave him 243 in his career, moving him past David Wright (242) for the second-most in franchise history. Darryl Strawberry’s 252 homers are the most in Mets history.

Rockies starter Chase Dollander continues to be hurt by the longball. McNeil tagged him for a leadoff homer in the second, and Alonso hit a two-run blast in the third. For the second outing in a row, Dollander was removed after just three innings.

“It all comes back to his command,” said Rockies manager Warren Schaeffer, now 5-20 since replacing Bud Black. “He’s getting behind in counts. He’s then working extremely hard to get back into counts and he’s throwing a lot of pitches.

“I think that leads to him going over the heart of the plate more often than he should. I have all of the confidence in the world in Chase Dollander going forward and being able to make adjustments.”

The Mets (42-24) not only swept the weekend series but also, on the heels of taking three from Colorado last weekend in Queens, swept the season series for just the second time in their history. In 2015, New York took all seven games from Colorado.

The Rockies’ 12-53 record through their first 65 games is tied with the 1932 Boston Red Sox for the worst start in the Modern Era (since 1901). To avoid their third consecutive 100-loss season, Colorado would have to go 51-46 for the remainder of the season. That doesn’t seem likely.

It might be June 8, but Colorado’s offense remains in hibernation. The Mets mashed 17 hits while the Rockies had 10, but a bunch of the Rockies’ hits came well after the game was decided.

And here’s a statistic that should make the gray-haired Blake Street Bombers cringe: At Coors Field this season, opponents have outhomered Colorado 44-28.

Mets right-hander Tylor Megill no-hit Colorado for four innings until Sam Hilliard led off the fifth with a double into the right-field corner.

Hilliard scored on catcher Braxton Fullford’s single, and Fullford scored on Jordan Beck’s double, cutting the Mets’ lead to 8-2.

Dollander’s big-league education must include trigonometry, calculus and physics, because it hasn’t been easy, as his 2-6 record and 6.85 ERA show. He departed after just three innings, giving up five runs on eight hits, including two home runs.

“To be honest with you, I’m not really doing my job right now,” Dollander said. “I want to be the guy who’s giving the bullpen a break. It’s a little frustrating when I don’t. I just have to keep after it.”

Serving up home runs has hurt Dollander throughout his rookie season. Of the 47 hits Dollander has allowed this season, 12 have gone over the wall, and his 2.42 home runs allowed per nine innings is the second-highest rate in the majors behind Toronto’s Bowden Francis.

Dollander said he’s not allowing his frustration to seep into his performance on the field, but admitted there have been tough moments.

“I’m definitely able to contain it, but when I get in (the clubhouse), alone, with my thoughts I (am) a little bit frustrated,” he said. “I put so much time and thought into every start, and when you go just three innings, it’s not the greatest feeling in the world. So it’s just about figuring out what to do.”

Asked if Coors Field has been more of “a beast” than he expected, he answered, “No.”

New York put the game away in the fourth with McNeil’s three-run homer off Juan Mejia, and rubbed it in with a two-run blast to right by Brett Baty in the seventh off Seth Halvorsen, Alonso’s two-run homer off Tyler Kinley in the eighth, and Francisco Alverez’s 450-foot solo homer to dead center off Zach Agnos in the ninth.