So there are really people out there who play unicycle hockey. They even have an international federation, leagues and championships.
https://en.wikipedia.org/wiki/Unicycle_hockey
It the rules become less kid-friendly, it could be the perfect blood sport for your cyberpunk dystopia. Or a bizarre trial-by-combat on a distant colony planet. Or simply a way of the villain (TM) to ridicule the heroes.
What a time to be alive.