Anthony Joshua fights over 12 rounds for the first time this weekend when he faces Denis Bakhtov in London's o2 Arena on Saturday night, live on Sky Sports.
The Olympic champion has won all eight of his fights inside three rounds but expects the experienced Russian to be a tougher test.
Bakhtov, 35, has won 38 of his 47 contests, 35 by knockout, and lost nine fights since turning professional 15 years ago.
Bakhov defeated Konstantin Airich on points in his last fight in July while Joshua stopped the same opponent inside three rounds in September.
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The Olympic champion has won all eight of his fights inside three rounds but expects the experienced Russian to be a tougher test.
Bakhtov, 35, has won 38 of his 47 contests, 35 by knockout, and lost nine fights since turning professional 15 years ago.
Bakhov defeated Konstantin Airich on points in his last fight in July while Joshua stopped the same opponent inside three rounds in September.
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