After the Breeders' Cup at Churchill Downs, jockeys Calvin Borel and Javier Castellano exchanged punches at the winner's circle.
Castellano responded by taking a swing at Borel, which prompted security officials to quickly break up the confrontation.
Castellano, who is 5-foot-1 and 110 pounds, had a clear advantage in the fight since he is four inches taller than Borel.
This fight may have been more entertaining than the one Sidney Crosby participated in earlier this week.
No one could have expected a fight to happen after a horse race.
Here are some videos of unexpected fights that have happened in horse racing and in other professional sports.