The Twins optioned 3rd baseman Danny Valencia to triple-A Rochester after hitting .190 with 1 homerun and 11 RBIs this season.  The Twins also designated for assignment lefthanded relief pitcher Matt Maloney.  Maloney has a 8.18 ERA with a 1-0 record in 11 innings pitched.  The Twins are calling up outfielder Darin Mastroianni and starting picher P.J. Walters from triple-A Rochester.  Mastroianni was .346 with 11 RBIs and Walters was 3-1 with a 2.70 ERA in 33 1/3 innings at triple-A Rochester.

Walters will start Saturday while Francisco Lirano moves to the bullpen.  Liriano is 0-5 with a 9.45 ERA this season for the Twins in 6 starts.