López's main pitch is a two-seam fastball in the mid 80s, and his secondary pitch is a slider in the high 70s.
Against left-handed hitters he will sometimes mix in a curveball.
López's distinctive sidearm delivery makes him appealing as a left-handed specialist; through the 2013 season, lefties have hit only .209 against him, while righties have hit .297.

After López struggled to begin his professional career, throwing over the top, he decided he needed to change his style.
In the Diamondbacks' system in 2002, with the help of Mike Myers, he began throwing sidearm (or submarine), which Andy Baggarly called "a decision that changed his life."
López's main pitch is a two-seam fastball in the mid 80s, and his secondary pitch is a slider in the high 70s. Against left-handed hitters he will sometimes mix in a curveball. López's distinctive sidearm delivery makes him appealing as a left-handed specialist; through the 2013 season, lefties have hit only .209 against him, while righties have hit .297.
After López struggled to begin his professional career, throwing over the top, he decided he needed to change his style. In the Diamondbacks' system in 2002, with the help of Mike Myers, he began throwing sidearm (or submarine), which Andy Baggarly called "a decision that changed his life."
Javier López (baseball)