Jason Frasor has tallied a 3.65 ERA through 17 appearances in his first season for the Rangers.
Jeremy Horst has not carried over his success from 2012, posting a 5.09 ERA and 1.58 WHIP over 17 2/3 innings.
Adam Ottavino boasts a 2.01 ERA over 22 1/3 relief innings for the Rockies.
Jose Valverde worked a scoreless ninth inning against the Twins on Thursday, striking out two and earning his fifth save of the season.
Rick Porcello was chased by the Twins for five runs on 10 hits over five innings Thursday, but escaped with a no-decision when Detroit mounted a late comeback.
Miguel Cabrera continued to torment major league pitching Thursday, going 2-for-3 with another homer in a comeback win against the Twins.
Josh Willingham blasted two homers and collected four RBI in Thursday's loss to the Tigers.
Scott Diamond surrendered three runs on nine hits and a walk over 5 2/3 frames in a no-decision loss Thursday to the Tigers.