Timaru's Cullen Le Roy finished eighth in a fleet of 54 in the Laser Radial Open fleet at Sail Sydney.
Only 10 of the 12 scheduled races were completed because of the light conditions on the last two days, with Englishman Jon Emmett taking the title.
Conditions were taxing, including tackling the congestion and mastering the strong tides.
The Laser Open fleet was won by Kiwi Sam Meech, with countrymen Andy Maloney fifth and Tom Saunders eighth.
Le Roy was sixth in a fleet of 41 in the Laser Radial Youth fleet.
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