Look back at this nasty #knockout by #mikaelamayer. She stopped Allison Martinez in the 3rd round. #boxinghighlights Next Up for Top Rank Boxing, two-weight world champion Natasha Jonas will defend her IBF welterweight world title against former unified world champion Mikaela Mayer in a landmark night for women’s boxing as two of the sport's biggest stars meet on Saturday, Jan. 20 at the M&S Bank Arena in Liverpool, England, live on ESPN+ in the U.S. and Sky Sports in the UK and Ireland. Try ESPN+ For Free: https://watch.espnplus.com/toprank/ Subscribe to our YouTube channel to get notified about the latest highlights, free full fights, and fight week content as it's posted. Follow Top Rank on Twitter: http://www.twitter.com/trboxing Follow Top Rank on Instagram: http://www.instagram.com/toprank Like Top Rank on Facebook: http://www.facebook.com/trboxing