BOSTON – Jason Giambi socked it to Curt Schilling, and Mariano Rivera stitched it up nicely for the Yankees.

Shaking off a steroid controversy and a slump, Giambi lined a two-run homer to break a sixth-inning tie last night. Bernie Williams added another to chase the postseason hero and give New York a 5-2 victory over the Boston Red Sox.

Mariano Rivera came on to pitch the ninth – earning a standing ovation from Red Sox fans who remember him blowing four consecutive saves against them, including Games 4 and 5 of last year’s AL championship series. But this time Rivera completed the job, earning his second save.

It was Schilling’s first appearance since blood seeped through his sock in Game 2 of the Series, when he had his right ankle stitched together and shut down the St. Louis Cardinals to set the stage for Boston’s first title since 1918.

The sock went to the Hall of Fame, but yesterday’s outing won’t earn Schilling any honors. After limiting the Yankees to three hits in the first four innings, he left with two outs in the sixth having given up five runs on five hits and a walk; he struck out five.

Schilling, who led the majors with 21 wins in 2004, did not lose at Fenway last year until August. Trot Nixon had two hits, including a homer.

Jaret Wright (1-1) allowed two runs, six hits, and four walks, striking out two in five innings. Williams, dropped to ninth in the order for the first time since 1995, had three hits and his first two extra-base hits of the season.

When Giambi stepped to the plate, there were a smattering of “Steroids!” chants before his at-bat and a hearty “Boo!” to greet his drive into the right field seats to make it 4-2. Tino Martinez grounded out, and Williams homered onto the roof of the Red Sox bullpen to chase Schilling

Alex Rodriguez was 0-for-5 and the only Yankee in the lineup who didn’t get a hit, delighting the Boston fans. Manager Joe Torre moved him to fifth from second in a lineup reshuffling that also leadoff man Derek Jeter to second and Williams from eighth to ninth.

It worked: The bottom four hitters were 8-for-15 and scored all five runs.

After hurting his right ankle at the end of the regular season, Schilling was knocked around by the Yankees in Game 1 of the AL championship series. Only an experimental procedure – tested on a cadaver – allowed him to win Game 6 and force a seventh game.

After the Red Sox dispatched the Yankees, Schilling had his tendon sutured again for his start in Game 2 of the World Series against the St. Louis Cardinals. He allowed no earned runs in six innings and, two games later, Boston finished the sweep for the title.

Derek Jeter went 1-for-5 and is 1-for-9 in the two games.