Seattle, WA (Sports Network) - Trevor Cahill tossed seven scoreless frames and Daric Barton hit two home runs, including a grand slam, and drove in a career- high six runs to power Oakland past Seattle, 9-0, in the second of a season- ending four-game set.
Cahill (18-8) allowed five hits, walked two and struck out six to become the first Athletics pitcher to win more than 17 games in a season since 2002.
Henry Rodriguez and Ross Wolf each tossed an inning to complete the six-hit shutout for the visitors, who lead the season series, 11-6.
Barton finished 3-for-4, while Rajai Davis was 2-for-3 with two runs scored, two walks and an RBI. Cliff Pennington chipped in with two hits, two runs and an RBI for the A's, who have won two straight after a six-game slide.
Luke French (5-7) took the loss after getting belted for eight runs on eight hits and a pair of walks while striking out three over four frames for the Mariners, who were shut out for the 15th time this season.
Barton's solo home run to right in the first inning got the Athletics started before they broke the game open with a six-run second.
Pennington's bases loaded infield single drove in the first run before Davis walked to force in another run. Barton then capped the frame with his first career grand slam to right.
Mark Ellis added an RBI hit in the fourth and Barton doubled home a run in the sixth to make it a 9-0 game.
Cahill finished the season with a 2.97 earned run average, the fourth lowest in franchise history since 1913 for a pitcher 22 years of age or younger. The A's finished 21-9 in Cahill's starts this season...Barry Zito with 23 andMark Mulder with 19 were the last A's hurlers to win more than 17 games...Barton had his first career multi-homer game...French fell to 0-3 in three starts against the A's this season and 1-4 in seven career games, five starts, against them...Justin Smoak went 1-for-3 to extend his hitting streak to a career-high eight games for Seattle...The Mariners have scored one run or fewer in a franchise-record 43 games and two runs or fewer in 72 games this season.