"We are evaluating ways to improve," Daniels told MLB.com. "In the meantime, all our focus is on the pennant race."
Purpura spent two seasons in the role overseeing the Rangers' Minor League System. He was previously the executive vice president and chief operating officer of Minor League Baseball for four seasons before he was hired by the Rangers in 2011. Purpura spent 14 seasons in the Astros organization, including as the club's general manager for 2 1/2 seasons. The Astros made their only World Series appearance with Purpura as the general manager in 2005.
T.R. Sullivan is a reporter for MLB.com. Read his blog, Postcards from Elysian Fields, and follow him on Twitter @Sullivan_Ranger. Master Tesfatsion is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.