Artur Beterbiev tears down Britain’s Callum Smith in seven to retain titles

• Beterbiev (20-0, 20 KO) retains WBC, WBO and IBF titles at 175lbs
• Russian's latest defense sets stage for unification bout with Bivol

Undefeated Artur Beterbiev defended three world light-heavyweight boxing titles by stopping Britain's Callum Smith in the seventh round on Saturday, winning by knockout for the 20th time in as many fights.

Beterbiev, a 38-year-old Russian-born Canadian, stopped the Englishman after two minutes of the seventh round in Quebec City, Canada, improving to 20-0 and remaining the only world champion to win every fight by early stoppage.