With the win, Oakland now owns the Cactus League's best record, with a mark of 11-4-1.
Facing Seattle right-hander Hisashi Iwakuma, whom the A's failed to sign in 2010 after winning his bidding rights, Oakland's Coco Crisp reached base on an error by shortstop Gabriel Noriega that proved costly. Eric Sogard followed with a base hit, and Josh Reddick continued his torrid spring by sending a two-run double to left field. Reddick is hitting .393.
With two runs already in, the A's added to their total on an RBI single by Manny Ramirez, who ultimately came around to score courtesy of Collin Cowgill's eighth consecutive hit. The A's outfielder had reached base in 11 straight plate appearances before lining out to second base in the sixth.
Oakland starter Graham Godfrey endured a rocky first inning, allowing one run on two hits and one walk, but settled down nicely, retiring his final 10 batters, five on strikeouts. Meanwhile, Iwakuma lasted four innings, giving up five runs -- three earned -- on seven hits with one walk and three strikeouts.
Ichiro Suzuki was responsible for Seattle's lone run, collecting an RBI base hit in the first.
Up next: Blake Beavan will take the hill for the Mariners on Saturday afternoon at 1:05 p.m. PT against the White Sox in Glendale, Ariz. Lucas Luetge, Tom Wilhelmsen, Hong-Chih Kuo and Oliver Perez are also scheduled to pitch for Seattle. Jake Peavy will start for Chicago.