Katie Taylor retained her undisputed lightweight world championship on Saturday, with a split-decision victory over Amanda Serrano on a historic night in Madison Square Garden in front of a raucous sellout crowd.

The Irishwoman — who stretched her unbeaten professional record to 21-0 — and Serrano were the first women to headline a fight at the world's most famous arena and put on a show-stopping performance equal to the occasion.

Swinging wildly with everything she had in the final rounds, Taylor was egged on with chants of "Katie, Katie, Katie," and the packed stands erupted in utter joy as the fight 140 years in the making went to the Irish sporting legend.