Papua New Guinea's Ryan Pini was the pick of the Pacific swimmers during day one of the World Short Course Champs in Doha.
The 2006 Commonwealth Games gold medallist finished last in a quick heat but 21st overall in the men's 100m backstroke in a time of 51.93 seconds.
That was an improvement on his time at last month's Australian short-course champs, but still six-tenths of a second shy of making it into the semi finals.
In some of the other Pacific results, Samoa's Winter Heaven was 70th overall in the men's 200m in 1.53.71.
Meanwhile Savannah Tkatchenko from Papua New Guinea was 34th overall in the women's 50m breaststroke heats in 34.25, pipping Fiji's Matelita Buadromo by 0.25.
Guam's Valerie Gruest was 26th in the women's 200m fly in 2.13.07 and Fiji's Douglas Miller was 83rd in the men's 100m breaststroke in 1.08.62.