Harrison improved her professional mixed martial arts record to 20-1 with the statement win, while Nunes dropped to 23-6. The bout marked Harrison's first title defense and her return to action following spinal fusion surgery in January to address a neck injury that had delayed the contest.

Nunes, widely regarded as the greatest female fighter in mixed martial arts history, ended a three-year retirement to challenge for the belt. The Brazilian started strongly, using her three-inch reach advantage and sharp boxing to test the champion at distance during the opening rounds.

The challenger landed 31 significant strikes in the early exchanges and scored two takedowns, keeping the pressure on Harrison. However, the champion's relentless grappling soon began to alter the momentum of the high-stakes encounter as the fight wore on.

Harrison used her background as a two-time Olympic judo gold medalist to drag the bout to the canvas and control the grappling exchanges. Operating from dominant positions, Harrison landed heavy short punches and elbows that drained the challenger's energy reserves.

By the fourth round, the physical demands of the contest had taken a heavy toll on Nunes. Harrison quickly secured top control on the mat, worked into a dominant back-control sequence, and locked in a rear-naked choke that forced the tap at Madison Square Garden.

Reflecting on her victory in her post-fight interview, Harrison admitted she was still processing the magnitude of the achievement. She acknowledged the physical toll of cutting down to the 135lb bantamweight limit and fighting through injuries.

The rivalry between the two athletes dates back to their time training together at American Top Team before Nunes departed in 2022 to start her own camp. Saturday's showdown settled the long-anticipated matchup on combat sports' grandest stage.

Stephen Thompson also featured on the card, signing off on his career with a third-round knockout victory over Charles Radtke in their welterweight bout. The 43-year-old fighter delivered a decisive spinning wheel kick to seal his retirement farewell.