The Seattle Mariners acquired left-hander Wade Miley and right-hander Jonathan Aro from the Boston Red Sox on Monday in exchange for right-hander Carson Smith and left-hander Roenis Elias.
“Wade is a proven major league starter who brings a level of stability to the middle of our rotation,” Mariners general manager of baseball operations Jerry Dipoto said in a statement.
Miley, 29, was 11-11 with a 4.46 ERA in 32 starts for the Red Sox in 2015. He threw 193 2/3 innings, the fourth consecutive season he has pitched in 32 games or more and tossed at least 193 innings. In his first American League season in 2015, he led the Red Sox in wins, starts, innings and quality starts (17).
Named an All-Star in his first full season with Arizona in 2012, Miley is 49-46 with a 3.95 ERA over 832 1/3 innings in 138 career appearances (134 starts) between the Diamondbacks and Red Sox.
Aro, 25, made his major league debut with Boston on June 25 and went 0-1 with a 6.79 ERA over 10 1/3 innings in six relief appearances with the Red Sox in 2015. The right-handed reliever combined to go 3-3 with two saves and a 3.04 ERA in 34 relief appearances combined between Double-A Portland and Triple-A Pawtucket.
Smith, 26, went 2-5 with 13 saves and a 2.31 ERA over 70 innings in 70 games with the Mariners in 2015. The right-handed reliever limited opponents to a .194 average in his first full season in the major leagues.
Smith provides the Red Sox with another solid pitcher out of the bullpen that now features new closer Craig Kimbrel as well as setup men Koji Uehara and Junichi Tazawa.
Elias, 27, went 5-8 with a 4.14 ERA over 115 1/3 innings in 22 games (20 starts) with the Mariners in 2015. He also made 12 starts with Triple-A Tacoma, going 4-2 with a 7.34 ERA over 61 1/3 innings.
Miley became more likely to be traded after the Red Sox signed ace left-hander David Price last week.