Caroline Dubois warned the rest of the lightweight division that she was only going to get better.
The British fighter - sister of Daniel Dubois, who fights Anthony Joshua live on DAZN on September 21 - was fighting Maira Moneo for the WBC interim belt on Saturday night.
The 23-year-old Briton was clearly dominant, with the judges awarding her a unanimous decision victory.
Moneo was dropped in the sixth, and the judges gave it 100-90, 100-89, 99-90 in Dubois' favour.
Speaking after her win, Dubois said she was pleased with her win given the tough fight.
"She definitely came in confident and you have to break somebody as well, that's a bit difficult to do at times," she told Sky Sports .
"I think I am getting better. I am 23-years-old, how many 23-year-olds get a knockdown like that against an undefeated fighter?"
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