SUN CITY: World No. 1 Lee Westwood of England stretched his lead to five strokes Saturday after three rounds of the Sun City Challenge. The 37-year-old who replaced Tiger Woods at the top five weeks ago had to settle for a one-under 71 at a sun-drenched 7162-metre Gary Player Country Club. It was his poorest round this week in the five-million-dollar tournament, but closest challenger and fellow Englishman Ross Fisher failed to take advantage after starting the round three behind. Fisher faltered badly after moving within two shots of Westwood with five holes left and missed a birdie putt on the last to end one over on 73 and sharing second place with South African Tim Clark. After failing to match par in the opening round, Clark has climbed steadily up the leaderboard and did not drop a shot during his third round despite struggling to get distance off the tee. Spaniard Miguel Angel Jimenez made too many visits to bunkers on the back nine and a 71 left him alone in third place, six adrift of Westwood. Ogilvy increases lead Geoff Ogilvy increased his one-shot overnight lead to five strokes after three rounds at the Australian Open, shooting a 5-under-par 67 Saturday at The Lakes to leave most of the field out of contention for his country's national championship. Ogilvy, the 2006 US Open champion, had a 54-hole total of 16-under 200. Australian Matt Jones, who trailed Ogilvy by a stroke going into the third round, fell off the pace with a 71, one shot better than Australians Greg Chalmers (66) and Alistair Presnell (67), who are tied for third, six back of Ogilvy. John Senden, who won the Australian Open in 2006, was in fifth place after a 70, level with fellow Australian Matthew Griffin, who shot 72, each seven strokes back. Ogilvy, who has won three World Golf Championship titles as well as his 2006 major, has never won the Australian Open. His only pro win Down Under came at the Australian PGA in 2008. He bogeyed the final hole Saturday, a tough par-3. However, Ogilvy headed to the practice range after his round. Greg Norman, who shot 70 Saturday and is 13 shots off the lead, said he was no fan of the new, slow undulating greens at The Lakes.