QUEBEC CITY (AP) -- Adonis Stevenson retained his WBC light heavyweight title Saturday night by stopping Tony Bellew in the sixth round.
Stevenson (23-1) knocked down Bellew (20-2-1) with a left uppercut. When the Englishman got up, he was stunned with another left, followed by a flurry of shots. Bellew was not fighting back, even though he was still on his feet when referee Michael Griffin stopped the bout.
It was a second defense for the Montreal fighter since taking the belt with a spectacular first-round knockout of Chad Dawson in June. He defended with a seven-round win in September over Tavoris Cloud.
In the co-feature, Sergey Kovalev kept the WBO light heavyweight title with a stunning knockout of Ismayl Sillakh only 52 seconds into the second round.
The hard-hitting Kovalev (23-0-1), a Russian based in Fort Lauderdale, Fla., is often mentioned as a future opponent for Stevenson.
After an uneventful opening round, Kovalev dropped the 15th-ranked Sillakh with a right early in the second.
The Russian was jumping up and down in his corner waiting to get back as the referee gave Sillakh (21-2) an 8-count, then ran up and floored him with another right that ended the bout.