Claressa Shields is the undisputed queen of middleweight boxing.
The double Olympic gold medallist added the WBO world title to her collection, by beating Christina Hammer at Atlantic City’s Boardwalk Hall in her native USA.
The unanimous points decision, in what was billed as the biggest fight in women's boxing history, makes the American a four-belt champion in the 72.6kg (160lb / 11st 6lbs) division.
Shields is only the second woman ever to unify all four major titles in the sport since Norway's welterweight champion Cecilia Braekhus.
She's also the sixth fighter in history, male or female, to achieve this feat.
Her professional record improves to 9 wins (2 KOs) and no losses.
It was Hammer's first defeat as a pro, taking her record to 24-1 (11 KOs).
The 24-year-old from Flint, Michigan, has already set her sights on the next opponent.
"Women's boxing, we're on fire. I cannot wait to see the next super fight. Give me Cecilia Braekhus at 154 pounds. That’s who I want next. Either her or Savannah Marshall." she said in the after-fight press conference.
British super middleweight champion Marshall is the only fighter ever to beat Shields, when she was still an amateur, at the World championships in 2012.
"I’ll go to the UK and beat Savannah Marshall,” Shields added. “Bring me her. Bring it to me."
"I am the greatest woman [boxer] of all time" - Claressa Shields after unifying world titles
The fight with Hammer had global appeal, and a a number of celebrities showed their support on social media, including Olympic athletics champ Allyson Felix, NFL star Von Miller, and Hollywood actress Halle Berry.
Double Olympic Champion
Claressa Shields took the middleweight gold medal at London 2012 as women's boxing made an Olympic debut.
She successfully defended her title at Rio 2016, the first American boxer to do so.
You can watch some of her Olympic highlights here:
Claressa Shields: My Rio Highlights
Claressa Shields: My Rio HighlightsThe best moments from the 2016 Summer Olympic Games
Shields wins Women's Boxing gold
Shields wins Women's Boxing goldUSA's Claressa Shields wins her second consecutive Olympic gold in women's boxing.