Alonso, 30, is hitting.266 with 17 doubles, 22 home runs and 49 RBI.
KANSAS CITY, Mo. (AP) — The Seattle Mariners acquired All-Star first baseman Yonder Alonso from the Oakland Athletics on Sunday for minor league outfielder Boog Powell.
The Mariners, who have not been in postseason play since 2001, entered a Sunday doubleheader at Kansas City, trailing the Royals by 1½ games for the second wild-card spot.
Alonso, 30, is hitting .266 with 17 doubles, 22 home runs and 49 RBI. He ranks second among American League first baseman with a.527 slugging percentage.
Alonso, a left-handed hitter, could platoon at first base with Danny Valencia. Alonso has 18 home runs, 40 RBIs and a.948 OPS against right-handed pitching this year.
Powell hit .194 in 23 games with three stints with Seattle this year. He has spent most of the season with Triple-A Tacoma, hitting.340 in 58 games.
In another trade, the Mariners acquired right-handed pitcher Ryan Garton and catcher Mike Marjama from the Tampa Bay Rays in exchange for Double-A pitcher Anthony Misiewicz, low-A infielder Luis Rengifo and a player to be named later.
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