Neither Kris Gemmell (Palmerston North) nor Tony Dodds (Wanaka) were able to finish the race, with Gemmell dropping off the lead group early in the bike before withdrawing after three of the eight laps.
While no details are available at this stage it is thought Gemmell had not shaken the lingering effects of a bout of food poisoning in the days leading up to the race.
Dodds struggled to stay with the pace in his first world championship series start, eventually withdrawing on the seventh bike lap while in 37th place.
The race was won with spectacular ease by Alistair Brownlee (Britain), with the youngster running away from Australian Courtney Atkinson and local favourite Javier Gomez (Spain).