From the Strib:

The Twins sent righthander Seth Greisinger to Class AAA Rochester after Saturday's game and called up righthander Matt Guerrier from Rochester.

Guerrier is a spot-hitter who throws around 89-90 miles per hour. He has a curve, slider and change up in his repetoire. He's 3-6 with a 3.57 ERA.

"He's pitched well but has had some back luck," said outfielder Michael Restovich, who was with Guerrier at Rochester.

Guerrier has just 12 walks in 80 2/3 innings to go with 58 strikeouts.

For now Guerrier is scheduled to start on Saturday in Milwaukee, but if Carlos Silva needs an extra day because of his slightly pulled gluteus muscle, Guerrier could start on Thursday against Montreal.

Heh. Gluteus.