After a night out at a nightclub, two men exchanged blows over supper at a coffee shop near Lorong 37 Geylang.
At around 3am on Monday, the two men, who appeared to know each other, got into a heated argument before the fight broke out.
Reporters reported that when the argument started, friends of the two tried to step in between them.
But their attempts were futile and punches were soon thrown.
Reporters reported the argument was initially between one of the men and a woman, before it escalated into a physical brawl.
The police were called and eight police cars were seen at the scene.
An employee at the coffee shop told reporters that he was shocked at the number of police cars.
A Mr Jiang also told reporters the coffee shop tended to get rowdy at night.
Mr Shen, who runs the coffee shop, said the group of diners came from a nearby nightclub just as he was about to leave for the night.
He added that the fight started out between two men, before a third later joined in.
Mr Shen said the metal gate outside his shop was damaged in the fight.
The fight, he added, lasted about 30 minutes and calmed down after the police arrived.
When contacted, a police spokesman told reporters they received a request for assistance at Lorong 37 Geylang at about 3.42am. He added: "The police have advised the respective parties on their legal recourse."