UFC 21: Return of the Champions

This event was historic because it introduced the 10-point must system, replacing subjective judging and permanently changing how UFC fights were scored. It also standardized five-minute rounds across preliminary, main card, and championship bouts, closely aligning the sport with what would become the Unified Rules. The card was headlined by Maurice Smith facing Marco Ruas and featured Pat Miletich defending his Welterweight Championship, reinforcing consistent divisional structure.