Rough conditions pounded the 1500 swimmers in the Harbour Crossing race in Auckland yesterday.
Australian Trent Grimsey, 24, led the 2.9km swim from Bayswater to the Viaduct Harbour in 35m 09s, ahead of two countrymen, double Olympian Ky Hurst and his brother Codie, who won in 2010.
Winds of up to 30 knots made the water extremely choppy.
"This was probably as tough as any race I've done in terms of the conditions," Grimsey said.
"It is a lot harder to swim in the chop than in flat water, but I think it affected my competitors a bit more than me.