Australians Tommaso D'Orsogna and Kenneth To dead-heated for gold in the 100m freestyle at the FINA World Cup short-course meet in Doha on Saturday night.

The pair touched the wall in a time of 47.10s ahead of American Anthony Ervin while another Australian, Kyle Richardson, was fourth.

With two gold medals presented for a dead-heat, they contributed to five golds for Australian swimmers on the opening night of the event in Qatar.

Rising 20-year-old To won his second with victory in the 100m medley final in a time of 51.58.

Fellow NSW swimmer Robert Hurley also won double gold with a narrow triumph in the 100m backstroke and a comfortable victory in the 400m freestyle.

After winning the backstroke double in Dubai during the week, Victoria's Rachel Goh had to settle for silver in the women's 50m backstroke behind Japan's Noriko Inada.

The Doha leg of the World Cup series finishes on Sunday night before moving to Stockholm next weekend.