Now we're talkin'! The colors are excellent. Perhaps a little shorter DOF next time to blur out the guys in the background, bringing out the girl on the left a bit more. Gotta love roller derby! Fun shot.
Pretty weak connection to the challenge if any at all. Setting that aside, the red eyes on the guy in the background really make this scream snapshot and that's never a good thing for a challenge entry. Composition could use some work as well.