TORONTO -- The .500 mark remains elusive for the Red Sox.
For the third time this season, the Red Sox had a chance to even their won-loss record, and for the third time, they failed, dropping a 7-6 extra-inning decision to the Toronto Blue Jays in the opener of a five-game road trip.
Twice, the Blue Jays had the lead and three the Red Sox roared back to tie the game.
But in the bottom of the 10th, Rajai Davis singled, then stole second and third and rode home on David Cooper's long sacrifice fly to center off Matt Albers.
The Sox looked headed to defeat earlier when Cooper homered off Daniel Bard in the eighth. But Adrian Gonzalez answered with a solo homer of his own in the top of the ninth. It was Gonzalez's second homer of the night and fifth in his last 10 games.
Jon Lester turned in his worst start since Opening Day, allowing three runs in the first thanks to three walks -- one with the bases loaded.
The Sox used run-scoring singles by Carl Crawford and a solo homer by David Ortiz to get back into the game.
They took the lead for the first time on a two-run, opposite-field homer by Adrian Gonzalez -- his fourth homer in the last eight games -- to go up 4-3, in the fifth.
After the Jays took the lead once more with single runs in the sixth and seventh, the Sox responded with an RBI-single from Jarrod Saltalamacchia in the eighth to forge a 5-5 tie.
Jacoby Ellsbury (three hits) extended his hitting streak to 19 games and David Ortiz had a single, double and homer.