The Red Sox have obtained outfielder Quintin Berry from Kansas City for righthander Clayton Mortensen.
Berry, 28, played 94 games for the Tigers last season, hitting .258 and stealing 21 bases in as many attempts. The Royals claimed him off waivers June 4.
Berry has spent the entire 2013 season in Triple A (for Toledo and Omaha) and not performed well, hitting .193 with a .309 on-base percentage and a .260 slugging percentage. He has 28 steals in 32 attempts.
Berry is not on the 40-man roster. Because of his speed, the Red Sox see Berry potentially being of use as a pinch runner if that need arises in September or beyond.
Because Berry is part of the organization before Sept. 1, he would be eligible for the postseason roster.
The 28-year-old Mortensen was 2-3 with a 4.11 ERA in 50 appearances over parts of two seasons with the Red Sox. A 5.34 ERA and a 1.58 WHIP, mostly in low-leverage situations, led to him pitching in only 24 games this season.
Mortensen was designated for assignment June 29, cleared waivers and was sent to Triple A Pawtucket. Mortensen had a 2.47 ERA in 14 games with Pawtucket, six of them as a starter. In those six starts, Mortensen was 2-0 with a 0.96 ERA over 28 innings.