After Jarrod Parker and Chris Tillman waged a magnificent pitching duel for eight innings it became apparent that a tense matchup between the Oakland Athletics and Baltimore Orioles was going to be decided by each team's bullpen.

Coco Crisp had a say in the matter too.

Crisp hit a tiebreaking homer off Darren O'Day leading off the ninth providing Oakland with a 2-1 victory Saturday and handing Parker his eighth straight win.

Parker (10-6) gave up one run five hits and three walks to improve to 8-0 in 16 starts since May 22. The right-hander threw 117 pitches and worked out of jams in the sixth and eighth innings.

When he walked off the mound for the last time Parker knew he was done. Instead of retreating to the clubhouse he watched as Crisp lined a breaking ball from O'Day (5-3) over the right field wall.

"It's gratifying that the guys are just able to pick you up" Parker said. "It's one of those things where it almost seems like it's meant to be when it happens."

Maybe it was. Crisp thought he'd received ball four earlier in the at-bat. He ended up trotting around the bases rather than jogging to first base.

"Tried to bunt tried to walk and I was still in the at-bat and I was able to get a pitch" said Crisp who has homered in each of his last three games.

Asked if he'd like to have that pitch back O'Day said "I'd like to have all of them back to him. I got behind in the count and he was looking for his pitch. I've got to be ahead in the count so yeah he got what he wanted and he did what he wanted with it."

Oakland manager Bob Melvin had no intention of sending Parker back out in the ninth. So he called upon closer Grant Balfour who got three straight outs for his 32nd save.

"There's no doubt he's done" Melvin said of Parker. "Good thing there are pitch counts. Both of those guys that game might have gone on for a while. Both those guys were dominant today. It usually takes one swing of the bat defensive play whatever and it was Coco's late. It was good to reward Jarrod because boy he pitched about as good as you can pitch."

So did Tillman who allowed one run three hits and two walks but remained winless since Aug. 2. His nine strikeouts tied a career high set earlier this month in San Francisco.

"Tilly bent but didn't break a couple times" manager Buck Showalter said. "It's frustrating. We end up on the losing side but watching two guys at the top of their craft matching each other you knew there was going to be a fine margin of error."

Kurt Suzuki doubled and scored a run in his first game back with Oakland after being traded from Washington on Friday. The victory broke a three-game skid for the A's who improved to 16-17 since the All-Star break and solidified their hold on the second and final AL wild-card slot.