Another instant classic from Katie Taylor and Amanda Serrano was marred by headbutts, a nasty cut and a controversial decsion.

Katie Taylor retained her unanimous super lightweight championship with another disputed decision over Amanda Serrano in a slugfest remarkably similar to the original 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.