With All-Star Bartolo Colon on the disabled list Jarrod Parker is now the A's ace - and he really has held that distinction for a month or more.

Parker was at his best again Monday night at the Coliseum throwing his first career complete game in Oakland's 2-1 win over Seattle - a walk-off victory thanks to Brandon Moss' homer to dead center off Carter Capps with one out in the ninth inning.

Moss said he didn't think his drive would travel far enough because it has been tough to hit balls out at night at the Coliseum this year. "I'm very surprised the ball went out" he said. "I was worried."

The A's who remained a half-game behind Texas in the AL West have seven walk-off wins this season. They're 15-9 in games decided in the final at-bat.

Moss did not get the customary walk-off pie to the face from Josh Reddick; Parker the man of the hour was the postgame TV interview. Reddick who'd been standing at the ready with pie tins held off using them. "I don't mess with pitchers" Reddick said.

Moss said he didn't mind getting away un-pied. 'The guy who deserved the pie was Parker" he said.

Parker has won his past seven decisions spanning 15 starts and he has the A's second-longest unbeaten streak in the past 39 years trailing only Dan Haren who went 16 games without a loss from April 13 to July 1 2007. Parker struck out a season-high eight batters many with his changeup.

"Absolutely you want to get the job done for the guy" Moss said. "He's been pitching outstanding lately."