NEW YORK - Shawn Chacon kept up his mastery of Toronto with eight dominant innings, Derek Jeter and Robinson Cano hit back-to-back homers leading off the first, and the New York Yankees opened their final home series of the season by beating the Blue Jays 5-0 Friday night.

Hideki Matsui and Tino Martinez also drove in runs in a four-run first, sending the first-place Yankees to their fifth straight win and 11th in 12 games. New York began the night a game ahead of Boston as the Yankees chase their eighth straight AL East title.

Chacon (6-3) improved to 3-0 with a 1.17 ERA in three starts against the Blue Jays this season. After pitching eight innings of four-hit ball in Toronto last Saturday, he allowed three hits in eight innings Friday, running his scoreless innings streak against the Blue Jays to 20.

Ted Lilly (9-11) handed New York its most recent loss Sunday in Toronto, but the former-Yankee was gone after 11 batters Friday. He allowed four runs and five hits in the shortest start of his career.

Jeter drove a 3-1 pitch over the right-field fence for his 17th homer. Cano also went the other way, lining an 0-2 pitch over the wall in left for his 13th and giving New York a 2-0 lead after eight pitches.

It was the fifth time in franchise history the Yankees led off a game with back-to-back homers, the first since Alfonso Soriano and Jeter at the New York Mets on June 28, 2003.

Alex Rodriguez walked and scored on Matsui's one-out double. An RBI single by Martinez, starting while Jason Giambi got another day off to rest his back, gave the Yankees a 4-0 lead.

Lilly left after walking Jeter and giving up a single to Cano to open the second. Shaun Marcum relieved and walked Rodriguez before escaping the jam. Gary Sheffield bounced to third baseman Corey Koskie, who stepped on the bag and threw home, but the Blue Jays botched the rundown, allowing Jeter to get back to third. Marcum then got Matsui to ground into a double play.

Chacon gave up consecutive hits to open the second, but got the next three batters - two on liners to Rodriguez at third. Frank Catalanotto singled with two outs in the third for the last hit off Chacon, but Matsui saved a run by running down Vernon Wells' long fly to left.

The Yankees added a final run in the seventh when Rodriguez singled and scored after reliever Vinnie Chulk threw a potential inning-ending double play ball into center field.

Notes: 1B Giambi was out of the lineup for the second straight day after leaving Wednesday's game when his back tightened up. He said he could have played, but manager Joe Torre rested him again with the teams playing a day game Saturday. "It's relaxed a lot more," Giambi said. "It's a lot better, definitely." ... Jeter had been 1-for-16 against LHP Lilly before hitting his 16th career leadoff homer.