Battling the SEC size and speed of the OU defense on the practice field helped him adjust to the athleticism of the defenses he’ll face in the fall. But by helping Arbuckle teach his new teammates the offense, Mateer believes he was able to hone the mental side of his game.

OU quarterback John Mateer has spent much of his life playing with a chip on his shoulder. Now that he's reached the upper echelon on college football, Mateer is embracing a different mindset.