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.
"I would prefer not to be in those situations, but they're definitely going to happen and I thought that was good damage control," Pelfrey said.
In the bottom half, Eduardo Escobar hit an RBI single. Urrutia homered in the fifth off Brian Duensing.
Starting time: Pelfrey allowed one run, five hits and one lamentable walk in 3 1-3 innings.