Eddie Hearn revealed how “very worried” he became for David Nyika when the cruiserweight remained motionless after being knocked out by Jai Opetaia.

Jai Opetaia (27-0, 21 KOs) remains a cruiserweight world champion after blasting out David Nyika (10-1, 9 KOs) in four rounds. The time of stoppage was 2:17.

World champion Jai Opetaia defends his IBF cruiserweight title with a brutal fourth-round knockout win over David Nyika in Australia.

Jai Opetaia retained his IBF cruiserweight title Wednesday with a spectacular fourth-round KO of David Nyika in Gold Coast, Australia. Opetaia, ESPN's No. 1 cruiserweight, and Nyika engaged in a firefight from the opening bell that featured nonstop exchanges of power punches.

Jai Opetaia stopped David Nyika with a vicious knockout on Wednesday, retaining the IBF cruiserweight title on home soil in Australia. Opetaia stopped the New Zealander in round four, landing a series of shots with Nyika stuck against the ropes and putting the challenger down and out with a brutal left hook.

Jai Opetaia is on a hot streak, and David Nyika is the latest challenger to fall to the Australian’s heavy hands. At a boxing event in Gold Coast, Australia, on Tuesday, Opetaia successfully defended his IBF cruiserweight title with a brutal fourth-round knockout of the previously undefeated David Nyika.