Katie Taylor retained her undisputed women's lightweight championship with a controversial and unpopular unanimous decision over Amanda Serrano on Friday night at AT&T Stadium. The fight was a return bout of their magnificent 2022 encounter at Madison Square Garden that Taylor won by a narrow split decision.

Amanda Serrano said Katie Taylor "100 percent" intentionally headbutted her during Friday night's undisputed women's super lightweight title bout.

Fierce rivalries are a cornerstone of boxing. But Taylor and Serrano, who will fight for a championship title on Netflix on Friday, are going about it differently.