Boston Red Sox second baseman Dustin Pedroia looses the ball and is charged with an error while... 
(AP)
David Ortiz had a tying RBI single and Mark Kotsay added a key two-run hit during a five-run seventh inning, and the Boston Red Sox avoided a three-game sweep by beating the Seattle Mariners 8-4 on Sunday.
All-Star Dustin Pedroia homered among his three hits for the Red Sox, who have not been swept at home this season. They also averted their first three-game losing streak at Fenway Park, where they improved to 26-12.
Ortiz and Jacoby Ellsbury also each hit solo homers.
Ronny Cedeno had a bases-loaded triple for Seattle, which won its first series in Boston since 2001.
Seattle, which has never swept a three-game series in Fenway, completed a nine-game road trip against the Dodgers, Yankees and Red Sox at 5-4.
Trailing 4-3 in the seventh, Boston took the lead against Seattle's bullpen. Ortiz's two-out RBI single tied it against Miguel Batista (5-3) after J.D. Drew walked and Pedroia singled. Reliever Mark Lowe then came in and walked consecutive batters, with Ellsbury's walk forcing in the go-ahead run.
Kotsay followed with a two-run single, making it 7-4. Ellsbury then scored on Kenji Johjima's passed ball before reliever Sean White ended it by striking out Jason Varitek.
Justin Masterson (3-2) pitched 1 1-3 scoreless innings of relief for the win.
Pedroia homered into the Green Monster seats and Ortiz hit his over the Mariners' bullpen in the first to give Boston a 2-0 lead.
The Mariners, who came back from early 2-0 deficits to win the series' first two games, took advantage of Pedroia's error to score three unearned runs on Cedeno's triple in the fourth.
Pedroia dropped third baseman Kevin Youkilis' throw on a potential inning-ending grounder with runners on first and second and one out. After Chris Woodward struck out, Cedeno's slicing drive down the right-field line bounced in front of a sliding Drew and rolled into the corner.
Boston starter Jon Lester allowed four runs — one earned — on eight hits, striking out nine and walking three while throwing a season-high 122 pitches. He had surrendered three or fewer runs in his last six starts, going 4-1.
