Dean Shu and Kim Wang beat the favourites at the Edgar Centre, on the way to winning the men's and women's titles respectively.
Fifth-seed Shu came up against the men's No 1 seed - former Dunedin player Nathan Xu - in the quarterfinals, but emerged a 3-0 victor.
He then had a close semifinal encounter with Ivo Mikulec, although came away with a 4-3 win.
The other semifinal between Hongy Li and Yi-Sien Lin was similarly close, Li claiming a 4-3 win.
However, Shu had too much in the final and after dropping the first game, won four in a row for a resounding 4-1 win.
Yesterday Shu and Xu faced off again, this time in the under-21 grade.
But Shu did not yield, claiming a 3-2 win.
In the women's singles the second-seeded Wang and top-seeded Guiting Li both cruised into the final.
There Wang took the ascendancy in winning the first three games, eventually taking a 4-1 win.
Meanwhile in the women's under-21 final Zhiying Cheng beat Maia Cavanagh 3-1.
Cheng and Li paired to beat Wang and Lisa Yue in the women's doubles final 3-0, while Hongy Li and Vladmir Ivanov beat Yi-Sien Lin and Ivo Mikulec 3-2 in a close men's doubles final.
There were 136 competitors in action over the weekend across various age-grades.
