Taylor retained her unanimous super lightweight championship in a razor-thin unanimous decision over Serrano in a slugfest remarkably similar to their epic bout in New York two years ago.

Katie Taylor’s controversial points decision victory over Amanda Serrano was met with boos at the AT&T Stadium on Friday as the Irish boxer retained her undisputed world light-welterweight champion status.

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.