TORONTO -- Brett Lawrie celebrated his first month in the majors with a game-winning home run.
"What a splash and what a start to a big league career," said appreciative manager John Farrell, who returned to the dugout after missing 10 games with pneumonia.
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Shawn Camp (3-3) pitched one scoreless inning for the win as the Blue Jays snapped a three-game losing streak.
Boston lost for the fifth time in seven games.
Promoted from Triple-A Las Vegas on Aug. 4, Lawrie made his debut at Baltimore the following day. One month in, he's made it look easy, batting .318 with eight homers and 21 RBI. The decisive drive off Dan Wheeler (2-2) was the first walkoff hit of his young career.
"My head is still going a mile a minute," Lawrie said. "It's one of those things that's very, very cool and I'll treasure it forever."
Wheeler said he missed with his location on the pivotal pitch.
"It was a fastball, just kind of flat," Wheeler said. "It went right down the middle. It was supposed to be down and away but didn't quite get there."
As good as he's been at the plate, Lawrie has been just as impressive defensively, helping turn a 1-5-6 double play that got Toronto out of a jam in the fifth.
"He has settled in at third base very well, not just from the throws but the reaction time, the different angles he's taken to some balls," Farrell said. "He's done an outstanding job for us."
Boston starter Josh Beckett left in the fourth inning after feeling pain in his ankle on consecutive pitches to Lawrie. He'll return to Boston on Tuesday to be examined by a doctor.
"It's always concerning," Beckett said. "That's my power leg."
Beckett slipped and fell while warming up in the bullpen, but didn't think that had anything to do with the pain that forced him out.
"I felt it on the second to last pitch and then it felt a little bit different on the last pitch I threw," he said. "I didn't feel it till those last two pitches.
"It felt like it was locked up and then it popped in and out of the socket or something," Beckett added.
Catcher Jason Varitek didn't notice anything out of the ordinary until Beckett missed with a 1-2 fastball to Lawrie.
"He seemed to make a funny face and kind of came off the mound funny on that pitch," said Varitek, who promptly called manager Terry Francona and trainer Mike Reinold out of the dugout.
After a brief discussion, Beckett walked off the field without assistance and was replaced by right-hander Alfredo Aceves.
"It was getting stiff and it was getting sore so we got him out of there," Francona said.
An All-Star for the third time this season, Beckett came in having won his past three starts. He allowed three hits in 3 2/3 scoreless innings with six strikeouts and one walk.
Blue Jays right-hander Henderson Alvarez pitched six scoreless innings, extending his shutout streak to 14 innings. Alvarez allowed four hits, walked one and struck out four.
"He had tremendous movement, just natural movement," Francona said. "The ball was diving all over the place."
The Red Sox put runners at first and second with two outs in the fourth but Josh Reddick struck out looking.
Scutaro hit a one-out double in the fifth but was caught in a rundown after Alvarez grabbed Ellsbury's grounder to the mound. Ellsbury tried to advance to second but was thrown out, completing the 1-5-6 double play.
Carlos Villanueva replaced Alvarez and walked Kevin Youkilis to begin the seventh. After Carl Crawford flied out, Reddick singled to right and both runners advanced on Varitek's grounder. Scutaro ended the inning by grounding out to shortstop.
Toronto put a runner at third base three times in the first four innings. Edwin Encarnacion struck out to end the first, Jose Molina grounded out and Dewayne Wise struck out in the second and, after Aceves walked Lawrie in the fourth, Molina ended the inning by flying out to right.
Jonathan Papelbon struck out Lind on three pitches to leave the bases loaded in the bottom of the 10th and has not allowed a run in 18 innings.
- Blue Jays SS Yunel Escobar (left wrist) missed his second straight game.
- Toronto reinstated RHP Dustin McGowan (shoulder) off the 60-day DL. McGowan last pitched in the majors July 8, 2008.
- Wise made a superb diving catch on Crawford's sinking liner to center to begin the ninth.