New video shows two professional boxers — including an undefeated Olympic silver medalist — beating the daylights out of a group during a one-sided brawl in a Florida parking garage, according to a report.

The video, first obtained by Slater Scoops, the website of radio talk show host Andy Slater, shows 10-0 featherweight Shakur “Fearless” Stevenson and 15-3-1 welterweight David “Day-Day” Grayton attacking a group of people in Miami Beach on July 1.

Stevenson, 21, is seen throwing a haymaker toward a man inside the parking garage, but missing and striking a woman standing nearby instead.

The two groups separate after Stevenson’s initial punch, video shows. Grayton, 31, then approaches two men and a woman, who retaliate and start hitting Grayton, leading to an all-out brawl, the footage reveals.

Photographs obtained by the website show an unidentified male and female victim, both of whom suffered black eyes and bruising on their faces during the attack. The male victim was left covered in blood and his eyes were nearly swollen shut, the photos show.

Stevenson and Grayton made comments to two women in the group that were sexual in nature, setting off the fight, ESPN reported. The male and female victims were treated at the scene, while Stevenson and Grayton fled before cops responded, police said.

Officers later caught up with the pair at a hotel in South Beach, where Stevenson was found with a cut on his lip and Grayton with cuts on his knuckles.

The footage of the incident may now lead to upgraded felony charges against the boxers, both of whom were arrested on misdemeanor battery, Slater Scoops reported.

Stevenson’s promoter, Top Rank chairman Bob Arum, had no immediate comment following the boxer’s arrest, ESPN reported.

A call seeking comment from Top Rank Boxing was not immediately returned Thursday.

Stevenson, a 2016 Olympic silver medalist originally from Newark, New Jersey, was celebrating his birthday at the time in South Beach. He’s next due in court on Sept. 27. His next fight, meanwhile, is scheduled for Saturday against Christopher Diaz at Madison Square Garden.