Brandon Waring hit a two-out homer in the ninth off Troy Patton to knot the score. Patton will serve a 25-game suspension at the start of the season after a positive test for a banned amphetamine.
Chen gave up one run, walked one and struck out three. He's got a 2.00 ERA in three outings this spring training.
Tommy Hunter, poised to take over for Jim Johnson as Baltimore's closer, worked a perfect fifth inning with a strikeout. The only two runs he's allowed in four innings came on solo home runs by Boston's Will Middlebrooks.
The Orioles used two singles and a walk to load the bases with no outs in the second against Mike Pelfrey but got only one run, on a sacrifice fly by Quintin Berry.
In the bottom half, Eduardo Escobar hit an RBI single. Urrutia homered in the fifth off Brian Duensing.
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