SAN FRANCISCO -- Jon Lester won for the first time in August, shutting out the San Francisco Giants on six hits over 8 1/3 innings as the Boston Red Sox opened a six-game Western swing with a 7-0 interleague victory Monday night.
The win allowed Boston to retain a one-game lead in the American League East over the Tampa Bay Rays, who beat the Baltimore Orioles 4-3 earlier Monday.
The day already was a memorable one for the Red Sox, who promoted 20-year-old phenom Xander Bogaerts to the big leagues for the first time. One of the game's top prospects, the five-tool shortstop/third baseman did not play after becoming the youngest position player to suit up for Boston since Dwight Evans debuted in 1972.
Lester, who had two no-decisions and a loss to Kansas City to show for his previous three August starts, coasted after being staked to a 3-0 lead in the second inning.
Pitching into the ninth inning for the first time since a complete game on May 10, Lester (11-7) struck out three and walked two. He has one shutout this season, but he's been involved in three combined shutouts.
The left-hander didn't allow a baserunner until Andres Torres led off the San Francisco fourth with a single, and he permitted only three Giants to reach second base.
Torres had three of the Giants' six hits off Lester, who improved his career interleague record to 12-5.
Right-hander Brandon Workman pitched out of a two-on, one-out situation in the ninth to complete Boston's seventh shutout of the season.
True to form, the majors' top-hitting team against right-handed pitching teed off on the Giants' Tim Lincecum for nine hits and five runs in five-plus innings. Shane Victorino had three of the nine hits, including an RBI single that capped the three-run second.
Daniel Nava had three hits, and Jarrod Saltalamacchia and Stephen Drew had two hits apiece in a 12-hit attack for the Red Sox. Ellsbury has now hit safely in all 13 of Boston's interleague games this season.
Saltalamacchia had an RBI double and Nava a run-scoring single in the ninth inning to provide Boston's final scoring.
Lincecum (6-13) was pulled one batter into the sixth inning with the Giants trailing 4-0. That baserunner, Ellsbury, eventually scored on a Guillermo Moscoso wild pitch.
The Red Sox got the upper hand early against Lincecum thanks in part to the right-hander's own stumble on the mound in the second inning.
Boston loaded the bases with no outs on singles by Saltalamacchia and Drew that sandwiched a walk to Nava. Saltalamacchia scored the inning's first run on a Will Middlebrooks sacrifice fly.
With Lester at the plate and squared around to bunt, Lincecum's right leg buckled as he began his delivery. He fell toward the plate and never let go of the ball, a balk that allowed Nava to score for a 2-0 lead.
Victorino's two-out single scored Drew with the inning's third run.
Boston's lead increased to 4-0 in the fifth off Lincecum when Drew's two-out double scored Nava, who had singled.
NOTES: The Red Sox's busy second inning also featured a catcher interference call on the Giants' Buster Posey with Ellsbury at the plate. ... The game pitted the team with the majors' best interleague record at day's start (Boston, 9-3) against the club with the second-worst (San Francisco, 4-10). ... The only two previous times the Red Sox have visited San Francisco, the losing team in the series (Boston in 2004, the Giants in 2010) went on to win the World Series. ... Bogaerts was one of eight Red Sox involved in transactions Monday. C David Ross and RHP Brayan Villarreal also were promoted from Triple-A Pawtucket, while INF Brock Holt, C Ryan Lavarnway and RHP Rubby De La Rosa went in the other direction. ... In order to create openings on the 40-man roster for Bogaerts and Ross, the Red Sox transferred RHPs Andrew Bailey and Clay Buchholz to the 60-day disabled list.