Another American man is out of the Olympic boxing tournament with a solid performance and a lesson for the future.

Flyweight Antonio Vargas lost on his 20th birthday Monday, dropping a unanimous decision to Uzbekistan's Shakhoibidin Zoirov.

Vargas accepted the decision with grace, even after putting on a strong third round against his older opponent. The prospect from Kissimmee, Florida, felt he could have changed things in a fight lasting longer than three rounds.

"I learned a lot of things here, and they're going to make me a better boxer going forward," Vargas said.

The six U.S. men in Rio dropped to 9-4 at the Olympics with one bronze medal and two boxers still scheduled to fight for medals this week. That's a marked improvement on the nine-man London team, which won only five fights and failed to bring home a medal.

The Americans' two women boxers in Rio are also still alive. Lightweight Mikaela Mayer fights for a medal later Monday, and middleweight Claressa Shields finally begins her gold-medal defense Wednesday.

The men's boxing delegation is the smallest at a non-boycotted Olympics since 1908.

The gold medal will be awarded Monday in the men’s heavyweight boxing division, as Russia’s Evgeny Tishchenko faces Kazakhstan’s Vassiliy Levit.