Boxing: How to watch Kell Brook's and Terri Harper's world-title bouts tonight
Firstly, WBC and IBO super featherweight champion Harper will put her titles on the line against Katharina Thanderz at Wembley Arena.
The Denaby fighter was crowned world champion with victory over Eva Wahlstrom in February and retained her titles in her first defence after a split decision draw against fellow Brit Natasha Jonas in July.
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Hide AdBoth Harper and Thanderz are unbeaten since turning pro and will go toe-to-toe on Sky Sports Mix. Coverage starts at 7pm with Irish superstar Katie Taylor defending her undisputed world lightweight title against the unbeaten Miriam Gutierrez at the top of the bill.
The bouts will also be shown free-to-air on Youtube.
Coverage of Brook's bout with WBO welterweight champion Crawford will begin at midnight on Premier Sports 1, with programming due to carry on until 6am on Sunday morning.
Former IBF welterweight champion Brook has fought just once in the last two years and enters his undisputed welterweight title challenge as a huge underdog against Crawford, who is unbeaten in 36 professional fights
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