BOSTON -- Mookie Betts scored a pair of runs and the center fielder helped spark the Boston Red Sox bats in a rain-shortened 7-1 win over the Baltimore Orioles in the annual Patriots' Day game on a drizzly Monday at Fenway Park.

The victory, which came after 6 1/2 innings and a 1-hour, 42-minute stoppage due to inclement weather, snapped a two-game skid for the Red Sox (8-5) and earned them a split in their four-game weekend series with the Orioles (7-6).

Justin Masterson (2-0) struck out six and the right-hander held the Orioles to one earned run on three hits and three walks in five innings for Boston.

Second baseman Dustin Pedroia went 2-for-3 with an RBI and was the lone Boston batter to have a multi-hit day. Betts was 1-for-4 and found himself stranded three times.

None of Baltimore left-hander Wei-Yin Chen's five runs were earned. Chen (0-1) allowed three hits, struck out three and walked five in 4 1/3 innings.

Center fielder Adam Jones cooled off after a hot start for the Orioles, going 0-for-2 with a walk. Second baseman Ryan Flaherty was 2-for-3 and drove in Baltimore's only run.

The Orioles had their first multi-error game of the season, committing three errors.

Betts hit a leadoff single to right in the first and stole second on the next pitch -- his fourth swipe of the season -- before taking third on a throwing error from Baltimore catcher Ryan Lavarnway.

A sacrifice fly to right from designated hitter David Ortiz drove in Betts to give Boston a 1-0 lead.

Orioles right fielder Travis Snider's second-inning triple to right-center slipped past Betts and rolled into the triangle, and Flaherty tied the game with a double off the wall in left.

The Red Sox opened things up in the third. With runners on the corners, Betts sent a dribbler to the mound, but Chen mishandled it and couldn't make a play as shortstop Xander Bogaerts scored.

First baseman Mike Napoli later walked with the bases loaded for his first RBI of the season, and Betts and Craig scored on Orioles third baseman Manny Machado's error, making it 5-1.

Pedroia lined to left for a double that scored catcher Ryan Hanigan and Craig brought him home with a hit to center in the sixth, capping the scoring.

Left fielder Hanley Ramirez departed with an undisclosed illness at the start of the third inning and was replaced by Craig. Ramirez grounded out in his only at-bat in the first.

NOTES: Boston hosted Baltimore for the seventh time and the second season in a row on Patriots' Day in Monday's series finale. The Red Sox are 68-51 all-time on Patriots' Day. The Orioles won last year's meeting 7-6. ... C Ryan Lavarnway returned to Fenway Park for the first time with Baltimore. Lavarnway spent parts of four seasons in Boston, batting .201 with five homers and 34 RBI. ... Orioles CF Adam Jones led the American League and ranked third in MLB with a .457 batting average entering play. ... Red Sox 3B Pablo Sandoval had the day off with a left-hander on the mound. He is 0-for-13 against lefties this year. ... Baltimore opens a three-game set with the Toronto Blue Jays on Tuesday to conclude a seven-game road trip. Boston starts a six-game trip of its own against the Tampa Bay Rays on Tuesday.