A controversial penalty point at the 65kg bronze wrestling bout resulted in two coaches stripping down to their underwear on the mat.
Seconds away from a victory, Mongolia’s Ganzorigiin Mandakhnaran started celebrating his assumed victory in front of his opponent, Iktiyhor Navruzov of Uzbekistan.
When the match ended, judges gave a penalty point to Navruzov because Mandakhnaran didn't engage with his opponent in the final moments of the bout. That resulted in Navruzov winning the bronze on criteria as the last wrestler to score, The Associated Press reported.
In protest of the controversial point, Mongolian coaches stripped on the mat. The audience booed the decision and chanted "Mongolia, Mongolia."
USA Wreslting, the national governing body for the sport in the United States, reacted to the point on social media with astonishment.
It wasn't the only eyebrow raising moment on the wrestling mats Sunday in the 65k division.
American Frank Molinaro, of Barnegat, New Jersey, faced Andriy Kvyatkovskyy of Ukraine in a toothy repecharge bout.
He won that match 8-5 to advance to the next bout -- after weathering what appeared to be a bite by his opponent on the arm.
"There is the chomp," an announcer said on NBCSN.
Despite a protest mid-match, Kvyatkovskyy was not disqualified.
Molinaro went on to compete against 2015 world champion Frank Chamizo, of Italy, who won the bronze medal 5-3.