Boston, MA -- (Sports Network) - David Ortiz went 2-for-4 with a solo homer and two runs batted in, as the Boston Red Sox scored five times in the seventh inning to defeat the Seattle Mariners, 8-4, and avoid a three-game sweep at Fenway Park.

Dustin Pedroia, who was voted as the AL starter at second base for this year's All-Star Game, finished with three hits, including a solo homer, for the Red Sox, who have split their last six games.

Jon Lester went 6 2/3 innings but did not figure in the decision. The left- hander gave up four runs -- one earned -- on eight hits while striking out nine and walking three. Justin Masterson (3-2) picked up the win after tossing 1 1/3 innings of perfect relief.

Ronny Cedeno had a three-run triple for Seattle, which has also split its last six contests.

"I thought we put ourselves in a position to win," Mariners manager Don Wakamatsu said. "I thought we played this game similarly to how we have the last four or five games. Going into the seventh, with a one-run lead, I thought Morrow did a nice job today, especially in this environment. Getting through the sixth inning was awfully big."

Brandon Morrow pitched to a no-decision after giving up three runs on six hits with seven strikeouts and two walks over six frames.

In the home seventh with Seattle holding a 4-3 edge, the Red Sox exploded for five runs to go in front.

Miguel Batista (5-3) started the frame for the Mariners and issued a one-out walk to J.D. Drew, and Pedroia followed with a single. After Kevin Youkilis flied out, Ortiz grounded a single through the right side to tie the game.

"It's nice to see David feel good about himself, where he wants to, where he feels good enough to commit like that. Morrow has a great arm. We had good swings." Red Sox manager Terry Francona said about Ortiz hit on a 3-0 pitch.

Mark Lowe then took the mound and walked Jason Bay to load the bases, and Jacoby Ellsbury's free pass allowed another run to score to put the Red Sox in front, 5-4. Mark Kotsay chased in a pair of runs with a single to end the afternoon for Lowe.

Sean White came on and uncorked a wild pitch that brought home Ellsbury to stretch the Boston advantage to 8-4.

After Masterson set down the M's 1-2-3 in the eighth, Hideki Okajima took the hill for the top of the ninth and retired the side in order to preserve the win.

Pedroia gave the Red Sox a quick lead when he slugged a one-out solo homer over the Green Monster in left, and, two batters later, Ortiz belted a solo shot to right to put Boston up, 2-0.

With the bases loaded and two down in the top of the fourth, Cedeno sliced a three-run triple just inside the right-field line to put the Mariners in front. Ryan Langerhans' sacrifice fly in the fifth put the M's up by two, but Ellsbury's solo homer in the sixth pulled the Red Sox to within a run.

Game Notes:

Seattle will begin a six-game homestand against Baltimore on Monday, while Boston welcomes Oakland to Fenway Park...It was announced earlier on Sunday that Red Sox outfielder Jason Bay has been voted to start this year's All- Star Game in St. Louis. Boston pitchers Josh Beckett, Tim Wakefield and first baseman Youkilis were also selected. Ichiro Suzuki got the starting nod in the outfield for the AL squad, while pitcher Felix Hernandez was also selected...The Mariners dropped to 7-18 over their last 25 visits to Fenway Park.