Australia’s Rachael Grinham (pic ri) is ready to the challenge on world No1 Nicol David after defeating Australian teammate Donna Urquhart (pic le) in the quarter-finals of the Australian Open 11-7, 11-4, 11-7 to book her place in the semis. Grinham, a former world number one herself, has not beaten David since the final of the British Open in September 2007. David cruised into the semi-finals when opponent Annie Au of Hong Kong was forced to retire with a leg injury midway through the 3rd game, when David was leading 11-0, 11-2, 4-0. Defending champion Madeline Perry won a close contest (13-11, 2-11, 12-10, 11-9) with 2009 winner Joelle King to reach the final four. Perry will meet 2nd seeded Englishwoman Jenny Duncalf who overcame Natalie Grinham of the Netherlands in tough 4 games 11-4, 12-10, 8-11, 11-8.