Amanda Serrano retains titles against Danila Ramos in historic contest
Her 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.
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.
Brazilian Ramos said she "knew this was the time" to be part of the historic contest, adding: "This was the time for me to come through, come by and to let the world meet me. I've always been a woman who fought for equality and women's rights."
Advocates for three-minute rounds argue more time spent in the ring increases the chance of a knockout and consequently a better spectacle.
However, Serrano and Ramos went the full 36-minute distance, with seven-weight champion Serrano winning all 12 rounds.
In 2007, Layla McCarter defeated Donna Biggers and Melissa Hernandez in a fight that was scheduled as 12 three-minute rounds.
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