Britain's Savannah Marshall became the undisputed super-middleweight champion with a majority decision points win over American Franchon Crews-Dezurn at Manchester's AO Arena.
The 32-year-old home fighter started slowly but landed the cleaner, heavier shots in a gruelling yet fast-paced contest.
The judges scored the fight 95-95, 99-92 and 97-93.
After the fight, Marshall called for a rematch with Claressa Shields.
With American Shields in attendance and a vocal presence at ringside, Marshall said: "Thanks for coming over, let's get it on at super-middleweight."
Marshall, who wins her 13th professional bout, suffered a devastating first career loss to bitter rival Shields in October.
Marshall overcomes tough Crews-Dezurn challenge
Promoter Ben Shalom said 8,000 tickets had been sold, but there appeared to be far fewer in the 21,000-seat arena.
Nevertheless, there was a loud reception for Marshall as the Hartlepool fighter, as challenger, walked first to the ring.
Then came time for the national anthems and what is possibly a boxing first. Baltimore fighter Crews-Dezurn - a singer who once auditioned for American Idol - took the mic and belted out the United States' anthem Star-Spangled Banner. The Manchester crowd, and Marshall, were less than impressed.
With the theatrics over, it was time for action.
It was a messy and cagey opening, both fighters smothering their work with Crews-Dezurn landing some solid hooks. Marshall responded with a straight right down the barrel in the second.
The early rounds were tough to score. Crews-Dezurn fell to the canvas in the third, the referee correctly ruling it a slip. Marshall was pushed to the floor in the following round. There was a lot of clinching and neither boxer was able to settle into their rhythm.
Marshall began to find her range, boxing behind the jab a little better and landing combinations in the middle rounds.
Despite boasting just two KO wins, 'Heavy-Hitting Diva' Crews-Dezurn did not stop coming forward, trying to rough up Marshall on the inside and throwing wild, looping hooks. But Marshall was keeping up with the pace and coming out on top of the exchanges.
