The ending of the second Ali-Liston fight remains one of the most controversial in boxing history. Midway through the first round, Liston threw a left jab and Ali supposedly went over it with a fast right, knocking the former champion down. Liston went down on his back. He rolled over, got to his right knee and then fell on his back again. Many in attendance did not see Ali deliver the punch. The fight quickly descended into disarray. Referee Jersey Joe Walcott, a former World Heavyweight Champion himself, had a hard time getting Ali to go to a neutral corner. Ali initially stood over his fallen opponent, gesturing and yelling at him, "Get up and fight, sucker!" and "Nobody will believe this!" The moment was captured by ringside photographer Neil Leifer in what became one of the most iconic images in sport, chosen as the cover of the "Sports Illustrated" special issue, "The Century's Greatest Sports Photos." Ali then began prancing around the ring with his arms raised in victory.