Berry, 28, was claimed by the Royals from the Tigers on June 4 but quickly outrighted to Triple-A Omaha. In 371 Triple-A plate appearances between the Tigers and Royals, he's batting .193/.309/.260 with 28 stolen bases in 32 attempts. Berry was significantly better when he saw regular time with Detroit last season, hitting .258/.330/.354 with a perfect 21 steals in 21 attempts in 94 games.
Mortensen, also 28, posted a 5.34 ERA with 6.2 K/9, 4.7 BB/9 and a 45.5 percent ground-ball rate in 30 1/3 innings for the Red Sox this season. Boston optioned him to Triple-A Pawtucket in late June and he's fared much better, pitching to a 2.45 ERA with 8.0 K/9 and 4.1 BB/9 in 44 innings. He's moved to the rotation recently, stretching out to seven innings in his most recent outing. Since moving to a starting role on Aug. 2, he's allowed just three runs in 27 1/3 innings.