Diamondbacks leadoff man AJ Pollack walked back to the visitor's dugout flummoxed. Felix Doubront had pin-pointed a changeup at the bottom of the strike zone that Pollack didn't like but it didn't matter. He was the first of what would be many Arizona hitters frustrated on a day dominated by Doubront.

The Red Sox lefty pitched seven scoreless innings to help beat the Diamondbacks Sunday 4-0. Not overpowering but efficient Doubront allowed five hits struck out five and walked none.

It was Doubront's second career scoreless start -- his first coming back in June against the Rays when he went eight full innings -- and represented a continuing trend of strong performances by the 25-year-old.

He has given up three earned runs or less in 19 of his 20 starts this season. Since returning to the rotation after a short stay in the bullpen earlier this year he has a 2.55 ERA in 15 starts.

Two brief Red Sox rallies in the fifth and sixth innings gave Doubront all the support he would need.

Stephen Drew led off the fifth with a single which was followed by a single from Brock Holt. Jacoby Ellsbury knocked home Drew with a sacrifice fly and Holt later crossed the plate on a one-out double by Dustin Pedroia.

In the sixth it was the bottom of the order yet again that got things started. After back-to-back singles by Jarrod Saltalamacchia and Stephen Drew and a sacrifice bunt by Holt Ellsbury hit a fly ball to right field that Arizona's Gerardo Parra lost in the sun. The ball dropped in for a single and Saltalamacchia scored. The score grew to 4-0 when Shane Victorino's single to center scored Drew from second base.

Victorino had two singles and was hit by two pitches after running into the right field wall in foul territory in an attempt to snag a foul ball in the third inning. The switch hitter batted right-handed for the remainder of the game even against righty starter Brandon McCarthy. He hit lefty in his first at-bat against McCarthy in the first inning.