Gymnast Max Whitlock won his second Olympic gold medal of the day by pipping British team-mate Louis Smith in the men's pommel horse.
Whitlock, 23, had earlier gained Britain's first-ever Olympic gymnastics gold with victory in the men's floor.
Smith, 27, had to settle for silver in the pommel - as he did at London 2012.
Whitlock's double success in the Olympic Arena helped Britain move up to 13 gold medals in Rio, taking their overall tally to 35.
"I've completely outdone myself,"
The penultimate man to go in the final, Whitlock scored 15.966 to push Smith, on 15.833, down to second place.
Alexander Naddour of the United States took bronze with 15.700.
Whitlock now has five Olympic medals, earning bronze in the all-around last week to add to bronzes in the team event and pommel horse at London 2012.
His victory on the pommel came less than two hours after winning the floor.
"I knew I had to refocus as I had another job to do," he said.
Smith won his third individual medal in three successive Games, after winning bronze at Beijing 2008 and silver - ahead of Whitlock - four years later.
He narrowly missed out on Gold in London and this latest near-miss means he is still searching for an Olympic title.
Smith was left in tears as he received his medal on the podium, before embracing his team-mate warmly as he stepped up.
"Max has been an absolute star in this competition,"
"He's been incredible. It's hard to keep composure when a team-mate has just won a medal. I just tried to keep focus."