Rapid Reaction: A's 2, Red Sox 1 (10th)

OAKLAND, California -- Right-hander Rubby De La Rosa allowed just one run and four hits over seven innings, but the Red Sox wasted his gem and fell 2-1 to the Oakland Athletics in 10 innings on Saturday afternoon at the O.co Coliseum.

The Red Sox lost their third straight game to Oakland, baseball's winningest team at 47-28, and will try to avoid a sweep Sunday in the series finale.

The Red Sox scored a combined 13 runs in seven games before facing Oakland on Saturday. Now, make that 14 runs in eight games.

A's center fielder Coco Crisp hit a walk-off single against Red Sox closer Koji Uehara with one out in the 10th and scored Alberto Callaspo from second. Callaspo had walked against Edward Mujica and moved to second on a sacrifice bunt. Crisp lined Uehara's first pitch to right for his seventh walk-off hit of hsi career and second this season.

Controversial call: The Red Sox caught what appeared to be a huge break in the eighth inning when they pulled even at 1-1. With two outs, Dustin Pedroia on third and David Ortiz on first, first baseman Mike Napoli faced a 2-2 count against right-handed reliever Luke Gregerson. Napoli appeared to strike out, but home plate umpire Quinn Wolcott ruled that he foul-tipped the ball and that it hit the dirt before catcher Stephen Vogt caught it. Video replay showed that the ball went directly into Vogt's glove, but the play was not reviewable under baseball's replay rules. Gregerson bounced his next pitch off of Vogt, and as the ball rolled toward the mound, Pedroia raced home to score on the wild pitch -- and scored easily. After Napoli flied out to right, an irate Bob Melvin continued arguing with Wolcott, and the Oakland manager was tossed.

Wasted opportunity: In the top of the 10th, Jackie Bradley Jr. grounded a one-out single to center off A's reliever Dan Otero and moved to second on Brock Holt's sharp single. But Otero retired Pedroia on a fly ball to right field, then struck out Ortiz.

Road warrior: Entering the game, De La Rosa was 2-0 with a 0.00 ERA in two starts at Fenway Park and 0-2 with a 6.35 ERA on the road. On Saturday, he proved that his good stuff travels. He handcuffed the A's with his mid- to high-90s heat and nasty changeup. De La Rosa struck out seven, walked one and threw 100 pitches but got a no-decision.

Costly first hit: De La Rosa didn't allow a hit until the third inning, but it was big and costly. Leading off, A's right fielder Stephen Vogt launched a triple that hit near the top of the high fence in right-center. Vogt, who hit a 2-1 changeup, scored on Callaspo's sacrifice fly and gave the A's a 1-0 lead. That snapped De La Rosa's streak of 10 2/3 scoreless innings

No answer for Chavez: A's right-hander Jesse Chavez became the latest opposing pitcher to have his way with the slumping Red Sox. Chavez had a no-hitter through five innings and blanked the Red Sox for seven innings on four hits. Chavez came into the game with a 6-4 record and 2.93 ERA, but he looked like a Cy Young Award lock against Boston.

Missed opportunity: Right fielder Holt broke up Chavez's no-hit bid in the sixth, when he sliced a leadoff single to left field. Pedroia lined a single to right, which moved Holt to second and brought Ortiz to the plate. Ortiz grounded into a 3-6-1 double-play, and Napoli struck out looking at an 0-2 fastball on the outside corner.

Crime watch: Holt is making a habit of robbing Callaspo with diving catches in right field. He stole a likely extra base hit Friday night by racing far to his left in the sixth inning. On Saturday, Holt went to his right and made a diving catch in the second inning of Callaspo's liner. But Callaspo didn't come away empty; he was credited with a sacrifice fly and RBI for driving in Vogt.