Reports indicate the deal has the Mariners swapping recently acquired catcher Wellington Castillo, reliever Dominic Leone and minor leaguers Gabriel Guerrero and Jack Reinheimer for Trumbo and left-handed pitcher Vidal Nuno.
Trumbo is hitting .259 with nine home runs in 46 games for Arizona this season. While with the Los Angeles Angels of Anaheim Trumbo had 95 homers and 282 RBI during his three full seasons with the team and finished second in Rookie of the Year voting in 2011 and was an All-Star in 2012. Trumbo is a career .248 batter with 118 HRs and 368 RBI in five-plus MLB seasons.
Nuno has a 1.88 earned run average in 14.1 innings pitched over three outings for the D-Backs this season. Before this season Nuno had been a career starter with 31 games started in his 39 career games pitched with the New York Yankees and Arizona with a career record of 3-15 and a career ERA of 4.13. MLB.com's Steve Gilbert tweeted that Nuno was told he will join the Seattle rotation, presumably filling James Paxton's role at least while he is out of action, despite Michael Montgomery's strong performance in his spot start on Tuesday. (Gilbert has since tweeted Nuno will join the bullpen see below).
Castillo only appeared in six games for Seattle after being traded from the Chicago Cubs in May. The catcher only racked up four hits and two RBI in 25 at bats. Castillo is a career .250 batter with 29 career home runs.
Leone had a strong rookie season in the Mariners bullpen, pitching 66.1 innings in 57 games with an 8-2 record and 2.17 ERA. The right-handed reliever had struggled so far in 2015 with a 6.35 ERA and a 0-4 record in only 10 games pitched by giving up 11 hits, nine walks and eight runs over 11.1 innings pitched.
To land Trumbo the Mariners had to give up two of the top 20 prospects as ranked by MLBPipeline.com. The minor league pieces were double-A stars No. 7-ranked Guerrero and No. 14-ranked Reinheimer. Both were playing for the Jackson Generals this season.