Where there’s boxing, there’s controversy, and there was no shortage of controversy in the blockbuster fight between Ireland’s Katie Taylor and Puerto Rico’s Amanda Serrano.

In front of an estimated 70,000 live fans at AT&T Stadium in Texas, and what may end up being one of the biggest television audiences in the history of boxing, Katie Taylor has won a unanimous decision in her rematch against the nine-time boxing world champion Serrano, retaining her IBF, WBC and WBO super-lightweight titles.

The Irish champion may have lost some fans however, after being accused of deliberately head-butting her opponent.

Taylor and Serrano were the co-main event in Netflix’s first live boxing event, headlined by former world heavyweight champion Mike Tyson and social media star Jake Paul.

It was the highest-profile and most lucrative bout in the history of women’s boxing, and for three rounds the fight was technical, brutal and evenly matched.

Then, in the fourth round, Taylor head butted Serrano, resulting in a large cut opening up above the Puerto Rican’s eye.

In the sixth round, a doctor was bought in to inspect the cut after the gash widened.

During the eighth round, the referee docked Taylor a point for yet another head butt, which was ruled as careless or intentional.

At the end of the tenth and final round both women were battered and exhausted, and the fans were at fever pitch after a stunning fight.

With or without the point deduction, the announcers all believed Serrano would take the decision, but the judges saw the contest differently.

All three judges gave Taylor the fight 95 points to 94.

Serrano was asked in her post fight interview about the head butts.

“(Taylor) kept headbutting me. But we knew that from the very beginning, from the first fight. That’s what they do. She did not only my fight she did it with Chantelle Cameron. Listen, I’m a Boricua. I’m going to die in this ring no matter how many cuts I have in my face.”

Asked whether she believed the headbutts were intentional, Serrano said she believed they were.

“I think 100%, because she does it in every fight. It’s not the first fight.”

Serrano said she wanted to fight Taylor again, and hoped to do it in a mixed martial arts fight.

Irish media reported that Taylor was set to pocket $6million (£4.7m) to defend her IBF, WBC and WBO super-lightweight titles. Serrano has claimed she is earning even more.