The Mariners have acquired outfielder Mark Trumbo and Vidal Nuno from the Diamondbacks for catcher Welington Castillo, pitcher Dominic Leone, infielder Jack Reinheimer and outfielder Gabby Guerrero.
Trumbo is hitting .259/.299/.506 this season. Trumbo figures to add power to a Seattle lineup that has been about average this year as the Mariners have a collective .395 slugging percentage.
"You look where we're at offensively and we're not doing exactly what I thought we'd do or what most people thought we'd do, and Trumbo is a guy that brings an awful lot to the table," Mariners general manager Jack Zduriencik said, per MLB.com. "He's a big power hitter that will bat somewhere in the middle of the lineup and will be very good insurance for the ballclub."
Late last week, CBSSports.com Baseball Insider Jon Heyman reported the Diamondbacks were potentially interested in dealing Trumbo, who has nine home runs and 23 RBI this season.
Zduriencik said Trumbo can play either corner-outfield spot, as well as designated hitter and first base.
"We'll have a rotation system where he'll get his ABs along with Nelson Cruz and the other corner players," Zduriencik said. "That will still unfold. More than anything else, to bring the bat to this organization is what we're desiring to do."