Katie Taylor edged Amanda Serrano on points with a split-decision victory in an instant classic at Madison Square Garden in New York.
The Irishwoman retained her undisputed lightweight title in a fight brimming with action, heart and excellence.
Two of the three judges saw it for Taylor in a fight that lived up to every prediction and every hope.
Taylor got the verdict on two cards, by 97-93 and 96-93 margins, with one judge scoring it 96-94 to Serrano.It was the first time two females had headlined the famous venue and after the first fight smashed every expectation, an even bigger rematch is surely in the works, with Dublin's Croke Park mentioned as a potential venue.
"Absolutely. We have to do this again," Taylor said after the result.
"It was an absolute war for 10 rounds. I'm grateful to be in this position and sell out Madison Square Garden. Look what we've just done.
"I said before that when you think Madison Square Garden you think Muhammad Ali v Joe Frazier, but now everyone will be thinking of Katie Taylor v Amanda Serrano. I knew I was going to have to dig deep and go to the trenches.
"I have the heart as well as the skill. I knew I was going to be able to pull through.
"She's a phenomenal fighter. A great, great person. It was a privilege to fight her again."
On such a seminal night for women's boxing, two of their greatest servants delivered. Matchroom promoter Eddie Hearn might talk a big game but he could never have envisioned selling out Madison Square Garden, 19,187 tickets to be exact, with Taylor.
The build-up has been dominated by the significance of the event but Taylor and Serrano's performance expressed the purest factor of women's boxing incredible rise. It has been the talent of the fighters and Taylor's unshakable resolve that has dragged women's boxing out of the shadows and into the spotlight.