Colorado receiver Javon Antonio, left, makes a leaping catch against cornerback Kyndrich Breedlove during Buffaloes’ football practice on Aug. 5, 2023, in Boulder, Colo. (University of Colorado Athletics) Throughout Colorado’s preseason camp, it became routine to see a No. 4 white jersey leaping over defensive backs to make catches. Javon Antonio needed a little bit of a time to adjust to the altitude in Boulder, but once he did, he shined. CU will open the 2023 football season on Saturday at TCU (10 a.m.