Top 15 college quarterbacks with the most to prove in 2015

Oct 11, 2014; Dallas, TX, USA; Oklahoma Sooners quarterback Trevor Knight (9) celebrates a fourth quarter touchdown after Samaje Perine (not pictured) scored against the Texas Longhorns during the Red River showdown at the Cotton Bowl. Oklahoma beat Texas 31-26. Mandatory Credit: Matthew Emmons-USA TODAY Sports

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