South Korean Grace Park surprisingly defeated Australia's Karrie Webb to advance to the quarter-finals of the World Ladies Matchplay Championship in Japan.

Park, the 1998 US amateur champion, beat the three-time US top money earner 1-up after an enthralling duel at the 6,467-yard Narita Golf Club course.

The Korean now faces Japan's Yuri Fudo who knocked out Australia's Rachel Teske by 3 and 1.

Japan's Chieko Amanuma and Takayo Bando, who ousted last year's finalists Annika Sorenstam of Sweden and Pak Se Ri of South Korea respectively, saw their hopes of further glory dashed.

Amanuma failed to win a single hole to go down 5 and 4 to Rosie Jones from the US, while Bando bowed to another American, Michele Redman 4 and 3.

Jones will play Han Hee-Won of South Korea, who beat American Laura Diaz by 3 and 2, while Redman will meet Sweden's Carin Koch who defeated Britain's Catriona Matthew by 5 and 3.

The other quarter-final match will be played between Lorie Kane of Canada and American Kelly Robbins.