– On a rainy, chilly Patriots' Day holiday, Baltimore made three errors that led to five unearned runs, Wei-Yin Chen struggled with his control and the Boston Red Sox won 7-1 Monday in a game shortened by rain to 6½ innings.

"The errors kind of gift-wrapped or built into the four-run inning, along with some bases on balls," Boston manager John Farrell said. "At this level, you give extra outs, you're asking for trouble."

Rain began falling steadily in the fourth inning, and the game was called after a 1-hour, 42-minute wait.

"It was the same for both teams," Baltimore manager Buck Showalter said. "It was a little bit hard for anybody on the mound to throw the ball where they wanted."

Boston's Justin Masterson (2-0) gave up one run and three hits in five innings with six strikeouts. He didn't want to change his plan to get five innings in before the rain, to make the game official.

"We're not just laying balls in there, because that's kind of the way things snowball," Masterson said. "All of a sudden now you've got the bases loaded and you're giving up a grand slam or putting people in a bad spot."

With the score tied 1-1, Boston scored four runs in the third when Chen walked four and made an error, and third baseman Manny Machado committed another error.

Chen (0-1) thought plate umpire Andy Fletcher had a small strike zone.

"When you make a pitch and can't throw it for a strike, you can't throw the next pitch down the middle," Chen said through a translator. "It kind of upset me."

Boston took a 1-0 lead in the first when Mookie Betts singled, stole second, took third on catcher Ryan Lavarnway's wild throw and scored on David Ortiz's sacrifice fly.