“I felt that I was winning the bout, but if the judges and the referee gave a different decision, then they have good grounds to do so,” Levit said.

The decision in the Tishchenko-Levit fight was made by judges from Algeria, Colombia and Ireland.

Judging controversies in boxing are not uncommon at the Summer Olympics. The light middleweight final in 1988 in Seoul appeared to have been dominated by the American Roy Jones Jr. But three of the five judges awarded the victory to his South Korean opponent, Park Si-hun. One judge later confessed to voting for Park to appease the Korean crowd.

Another future world champion, Evander Holyfield, was involved in a dubious ruling in a semifinal when his knockout punch of Kevin Barry of New Zealand was ruled a late hit and he was disqualified. But because Barry had been knocked out, he was not allowed to fight in the final. Both the referee and the beneficiary, the gold medalist Anton Josipovic, were from Yugoslavia.

In 1964, a South Korean fighter, Choh Dong-kih, refused to leave the ring for almost an hour after he was disqualified. In 1988, his countryman Byun Jong-Il staged an even longer sit-in after losing a decision, one that prompted South Korean officials to attack the referee.

The dispute on Tuesday came as AIBA has tried to assert control over the fragmented boxing world. In June, the group voted to let professionals box in the Olympics for the first time; all three professionals that entered have been eliminated. The group also has allowed men boxers to fight without head guards because it said they would absorb fewer concussions that way.

Questions about the judging in Rio, however, have threatened to undo efforts by Dr. Ching-kuo Wu, the head of the organization, who has tried to clean up a sport plagued by controversy. One way he has done that has been to alter the scoring system.