MLB Power Rankings: Pirates, Astros Rise
By Blake Benard

Jul 31, 2015; Houston, TX, USA; Arizona Diamondbacks catcher
Welington Castillo(7) rest at second base after hitting a double against the Houston Astros in the sixth inning at Minute Maid Park. Mandatory Credit: Thomas B. Shea-USA TODAY Sports
63. . . Previous: 16th. Detroit Tigers. 16. team
17. team. 8. . . Previous: 17th. Arizona Diamondbacks
Chicago White Sox. 18. team. 128. . . Previous: 18th
team. 127. . . Previous: 19th. San Diego Padres. 19
. . Previous: 20th. Texas Rangers. 20. team. 126