TORONTO - Jason Varitek hit a three-run homer and drove in four runs as the Boston Red Sox extended their win streak to a season-best eight games with a 16-4 victory over the Toronto Blue Jays on Saturday.

David Ortiz also hit a three-homer for the Red Sox in a seventh-run fifth inning as the Red Sox rapped out 18 hits. Edwin Encarnacion hit a two-run homer for Toronto.

The Red Sox slammed right-hander Brandon Morrow (2-4) for 10 hits and nine runs in 4 1-3 innings and 103 pitches. Morrow's earned-run average soared to 5.63.

The Blue Jays used seven pitchers in the game, finishing with Mike McCoy who started the game at second base. It was the fifth time a position player has pitched for Toronto and the first since Frank Menechino in 2004.

McCoy drew cheers from the crowd for his 1-2-3 ninth.

Boston right-hander John Lackey (4-5) allowed six hits and four runs in six innings while striking out eight.

The Red Sox (38-26), who have the best record in the American League, also had a seven-game win streak from May 13-20. The Blue Jays (32-33) dropped below .500 for the first time since May 27 and are 6 1-2 games behind Boston in the AL East.

Boston struck for four runs in the third. Adrian Gonzalez drove in one run with a double. After Ortiz was walked to load the bases, Morrow hit Jed Lowrie with a pitch for the second run. Carl Crawford hit a sacrifice fly and former Blue Jay Marco Scutaro singled in the fourth run on his way to a four-hit game.

Morrow walked the No. 9 hitter Varitek to start the fourth and he scored on Dustin Pedroia's double. Pedroia also doubled in two runs against Casey Janssen in the three-run eighth.

The Blue Jays cut the lead to 5-2 with a pair in the bottom of the fourth. Adam Lind doubled with one out, Jose Molina walked with two out and Rajai Davis doubled them home.

The Red Sox put the game away with a seven-run fifth, led by Varitek's third homer of the season that ended Morrow's start. Ortiz followed suit against Jason Frasor with his 16th of the season. J.D. Drew drove in the first run of the inning with a single.

The Red Sox tacked on a run in the sixth on Varitek's single, his fourth RBI of the game. Encarnacion hit his second homer of the season after Lind singled to make the score 13-4. It was the first time this season Encarnacion has had more than one RBI in a game. He has 12 for the season and these were his first since May 29 when he hit his first homer of the season.