Australian swimmer Trent Grimsey has been stripped of his State Harbour Crossing title.
Grimsey, 24, won the 2.9km open water swim across the Waitemata Harbour on Sunday by more than a minute, but was accused of deliberately obstructing another competitor about a third of the way through the race.
State New Zealand Ocean Swim Series event director Scott Rice investigated and disqualified Grimsey.
"Trent is an outstanding swimmer in superb form, but we have to ensure that every competitor is given an equal opportunity to win, and in this case that didn't happen" Rice said
Grimsey's disqualification means another Australian swimmer, Ky Hurst, is the confirmed winner of the race, with Codie Grimsey, Trent's brother, moving up to second, and South African Troy Prinsloo was confirmed in third place.