Rockies 8, Red Sox 3: Tyler Chatwood allowed an unearned run over seven innings and host Colorado hit three solo homers to win the series opener.

Charlie Blackmon, Troy Tulowitzki and Corey Dickerson homered off Boston starter John Lackey and slow the Red Sox's bid to earn home-field advantage in the American League playoffs.

Chatwood (8-5) allowed three hits over seven innings to earn his first win since July 26 as the Rockies improved to 45-35 at home. Michael Cuddyer had two hits and two RBIs and DJ LeMahieu added a two-run single for Colorado, which broke the game open with four runs in the seventh.

Lackey (10-13) gave up four runs on six hits in as many innings to fall to 17-10 lifetime in interleague play. Jarrod Saltalamacchia hit a two-run homer in the ninth for Boston, which leads Oakland by one game for the best record in the AL.

The Rockies jumped on Lackey when Blackmon led off the bottom of the first with a homer to extend his hitting streak to nine games. Cuddyer doubled and scored on Todd Helton's single later in the inning before Tulowitzki went deep in the fourth and Dickerson belted a shot in the fifth for a 4-0 edge.

GAME NOTEBOOK: Helton's first-inning run-scoring single was his 1,403 career RBI, one behind Juan Gonzalez for 73rd place on the all-time list. ... Red Sox CF Jacoby Ellsbury, sidelined since Sept. 6 with a fracture of the navicular bone in his right foot, is scheduled to return to the starting lineup on Wednesday. 1B Mike Napoli (plantar fasciitis) sat out his third straight game but is also expected back Wednesday. ... Cuddyer's two hits boosted his National League-leading batting average to .335.