The Twins on Saturday released Scott Diamond to make room in Triple-A Rochester's rotation for Trevor May, according to Jim Mandelaro of the Rochester Democrat and Chronicle.
May needed to be activated from the disabled list after recovering from a strained calf.
Diamond had a great season for the Twins in 2012, when the lefthander went 12-9 with a 3.54 ERA and a 90:31 strikeout-to-walk ratio in 173 innings.
But he struggled mightily this season for the Red Wings. He was 4-7 with a 6.53 ERA in 17 appearances (15 starts) and a 47:22 strikeout-to-walk ratio. He allowed 109 hits, including 10 home runs in 80 innings. Triple-A opponents hit .328 off Diamond.
May will start Sunday for the Red Wings, according to Mandelaro, and appears to be a strong candidate for a second-half call-up to the Twins.