Abstract

This study examined the evolution of action frequencies associated with victory in UFC bouts across three distinct eras (2003-2004, 2013-2014, and 2023-2024). A total of 1722 fights were analyzed: Early Era (2003-2004; n=77), Transition Era (2013-2014; n=813), and Modern Era (2023-2024; n=832). Action frequencies were recorded for six categories. Significant Strikes showed the largest temporal increase, rising by 125% among winners and by 225% among losers between the Early and Modern Eras. Generalized linear mixed models identified Significant Strikes as the strongest within-bout predictor of victory, followed by Total Strikes, whereas knockdowns showed no significant within-bout association. Logistic regression identified knockdowns as the strongest marginal correlate (OR=2.48). A descriptive hierarchical ranking placed Knockdowns first, followed by Total Strikes, Significant Strikes, and Takedowns. Takedowns demonstrated declining importance, with winner-loser differences decreasing by 23% from the Early to the Modern Era. Submission Attempts showed modest importance (12.8%), whereas Sweeps remained negligible (0.4%). These findings suggest substantial changes in UFC fighting strategy, with an increased emphasis on striking-based actions associated with victory. Nevertheless, grappling-related actions collectively accounted for a meaningful proportion of the combined importance ranking, indicating that modern MMA reflects an integration of striking and grappling rather than a simple replacement of one with the other. Although striking proficiency has become increasingly important, defensive grappling skills remain a baseline requirement.