SYDNEY  South Korea's world number eight Shin Ji-Yai won the Women's Australian Open Sunday, ending two strokes clear of Taiwan's top-ranked Tseng Yani and four ahead of teen star Lydia Ko at 18-under. Shin took an early lead in the fourth and final round at the Royal Canberra Golf Club, expected to be a shot-for-shot contest with New Zealand amateur Ko, 15, who was chasing an historic second US LPGA win.