The Oakland Athletics have traded first baseman Yonder Alonso to the Seattle Mariners for minor league outfielder Boog Powell.
The team announced the trade Sunday afternoon.
Alonso, 30, is having a breakthrough power season while playing on a one-year contract, batting .266 with a career-high 22 home runs and 49 RBIs. His previous career high for homers in a single season was nine in 2012 with the San Diego Padres.
He has seen a power dip since the All-Star break, with only two home runs and a slugging percentage that has dropped to .