Smithfield Boxing Club delivered a knock-out line-up to launch its tournament, which is taking place over the coming days.
Olympic boxing medallist Paddy Barnes, WBO Middleweight World Champion Andy Lee and UFC fighter Cathal Pendred were all on hand to show their support for the boxing festival.
Training sessions have been taking place all this week at the Smithfield club, culminating in a boxing tournament tomorrow and Saturday. Boxers from eight countries will compete in the ring against each other.
The three champs have a huge Irish fan base.
Andy Lee's (inset) world title defence against Billy Joe Saunders was postponed after the challenger suffered a cut eye while sparring.
The two were scheduled to fight at the Manchester Arena on October 10, having already had their original date of September 19, at Ireland's Thomond Park, postponed after Lee caught a virus.
"We are looking to reschedule it, for December possibly," Andy told the Herald.
"It's not set in stone yet. We are just waiting to see what the doctors say on their side, and then the new date will be set," said Andy, who returns to England today for training.
Meanwhile, Paddy said that he wanted to come along yesterday to support the club.
"This is a small club in Dublin and they are attracting countries as far afield as the Ukraine. It's a pretty big thing," he said.
Mixed martial arts fighter Cathal is currently preparing for his 3 Arena bout against Tom Breese in October.
"I am gearing up for that at the moment," he said.