Amanda Serrano vacates WBC title after organisation refused to sanction 12 three-minute rounds
Serrano's WBC title was not on the line as the Mexico City-based sanctioning body would not endorse extending the length of the rounds in female boxing, citing "health and safety" concerns.
It was the first time since 2007 women have been in the ring for a title fight for as long as their male counterparts.
"I am the only boxer, male or female, from Puerto Rico to become undisputed champion. I am the only female boxer to have won titles in seven divisions," Serrano said.
"I am the first female boxer, along with Katie [Taylor] to headline Madison Square Garden. I am the first female boxer to make seven figures from a fight and the same from sponsors.
"And I am the first undisputed female champion to fight 12x3 minute rounds.
"Moving forward if a sanctioning body doesn't want to give me and my fellow fighters the choice to fight the same as the men, then I will not be fighting for that sanctioning body."
Earlier this year, more than 20 current and former women boxers, including Serrano, signed a statement saying they wanted to be able to fight three-minute rounds.
Advocates for three-minute rounds argue more time spent in the ring increases the chance of a knockout and consequently a better spectacle.
Serrano and Ramos went the full 36-minute distance, with Serrano winning all 12 rounds.
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