The Rangers have placed righty reliever/starter Dustin Nippert on the 15-day disabled list due to a mild head injury. Nippert was hit in the head by a line drive off the bat of Tigers’ outfielder Austin Jackson. Nippert has pitched in 28 games (2 starts) for the Rangers this year and he is 3-4 with a 5.36 ERA and a 1.98 WHIP. The Rangers have called up 27-year old righty reliever Doug Mathis to replace Nippert in the pen. Mathis has pitched in 10 games (0 starts) for the Rangers this year and he is 1-1 with a 6.98 ERA and a 1.97 WHIP.