Manager Ron Washington said Roy Oswalt will get a few days off and then go back to the bullpen after his spot start on Thursday against the Twins.
General manager Jon Daniels turned 35 on Friday.
Joe Nathan has been successful on 23 straight save opportunities. That's the longest single-season streak in club history. The overall record is 25, set by John Wetteland in 1997-98.
Michael Kirkman was charged with a blown save on Thursday night, ending the Rangers bullpen's streak of being successful in seven straight save opportunities. The Rangers have just six blown saves on the season, the lowest in the Major Leagues.
Tanner Scheppers gave up two runs in the ninth inning on Thursday. That snapped an 18-inning scoreless streak for the Rangers bullpen.