SOCHI, Russia — Murat Gassiev of Russia knocked out Yunier Dorticos of Cuba with less than 20 seconds remaining in the final round to unify the IBF and WBA cruiserweight titles.

The victory early Sunday in Sochi’s Bolshoi Ice Dome qualifies Gassiev for the World Boxing Superseries final against Oleksandr Usyk of Ukraine in May. Usyk holds the WBO and WBC belts.

Gassiev’s record rises to 26-0, with 19 knockouts.

It is Dorticos’ first professional loss; he’s 22-1 with 21 knockouts.

Dorticos took the initiative in the early rounds, but Gassiev picked up the tempo in the fifth and Dorticos clearly tired.

In the last round, Gassiev knocked him down twice before a right roundhouse drove him through the ropes and ended the bout.

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