Nick Swisher hit a grand slam to help the Yankees erase a nine-run deficit, then he added a two-run double to give them the lead as New York posted back-to-back seven-run innings to beat Boston 15-9 on Saturday and send the Red Sox to their fifth straight loss.
A day after Red Sox starter Clay Buchholz gave up five homers and the Yankees spoiled Fenway Park's 100th anniversary party, Boston chased New York starter Freddy Garcia after 1 2-3 innings and opened a 9-0 lead through five. But Mark Teixeira homered twice, the second a three-run shot in the seven-run seventh that cut the deficit to 9-8.
Swisher hit a two-run double off the center field wall in the eighth to make it 10-8. Teixeira, who homered from both sides of the plate for the 13th time in his career, and Swisher each had six RBIs.
Rafael Soriano (2-0) pitched one inning of scoreless relief.
Red Sox closer Alfredo Aceves (0-1) gave up five runs without retiring a batter in the eighth.
It was Boston's second straight loss to the rival Yankees, each of them heart-breaking in its own way. Friday's 6-2 loss cast a pall over the feel-good 100th anniversary celebration, but the sequel on Saturday exposed the bullpen and had the hometown fans booing manager Bobby Valentine just 14 games into his Red Sox career.
Valentine tipped his capped to the fans as they booed him when he walked back from making a pitching change in the eighth.
Felix Doubront held New York scoreless on three hits until Teixeira hit a solo homer with two outs in the sixth. By that time, Boston led 9-0 thanks in part to a two-run homer by Cody Ross and RBI doubles from Adrian Gonzalez and David Ortiz.
Ortiz had four hits and a walk, and Mike Aviles drove in a pair of runs for Boston, which has now won just 11 of 41 games dating back to Sept. 1, 2011.
The Yankees improved to 9-3 since they were swept in the season-opening series by the Tampa Bay Rays.
The Red Sox scored two in the first on back-to-back RBI doubles from Ortiz and Gonzalez, added three in the second to chase Garcia and then made it 7-0 in the third. Ross homered in the fifth to give Boston a 9-0 lead.
Teixeira hit a solo homer in the sixth, then the Yankees made it a one run game with Swisher's grand slam and a three-run shot by Teixeira.
Swisher put the Yankees up 10-9 with a drive off the center field wall. There was still nobody out in the inning when Teixeira added a two-run double; Russell Martin added a two-run, two-out double and Derek Jeter was given an RBI single that made it 15-9 when shortstop Aviles slipped and fell on his rear end as he went to throw to first.
NOTES: The Yankees shut down RHP Michael Pineda when he felt weakness in his shoulder after 15 pitches during an extended spring training game in Tampa. ... Yankees manager Joe Girardi said LHP Andy Pettitte would probably make his next start in Double-A Trenton and be limited to 80-85 pitches. ... Red Sox 3B Kevin Youkilis left the game in the fourth inning with a bruise on his left quadriceps. ... Garcia allowed five runs on seven hits while getting just five outs. He has just one win in his last 10 appearances since 2008. ... Ortiz is 17 for 32 on the homestand with 10 RBIs. ... The most runs the Yankees have scored after the sixth inning was 16, against the Red Sox on June 19, 2000.