>I'd like to see every athlete who has something to "prove" on the track also have to prove they can type in grammatically correct English.<
Do you suppose our sprinter friend appreciated the humor? Well, if he didn't, I'll explain that your sentence was itself not grammatically correct because of the mis-matching of a singular subject (every athlete) and a plural verb (have to prove). Very clever, young man. You'll go far, even if you don't throw far.