cool Martin Kaymer reached the final of the WGC-Accenture Match Play Championship Saturday to ensure he will take over as world No. 1 when the new rankings are issued Monday. Kaymer beat American Bubba Watson one up in a closely contested semifinal at Dove Mountain's Ritz-Carlton Golf Club and will face Britain's Luke Donald in Sunday's title match. In-form Donald crushed American Matt Kuchar 6&5 on a blustery afternoon in the Arizona desert to give himself a chance of climbing to a career-high third in next week's rankings. Kaymer, the second seed for the elite World Golf Championships (WGC) event, had his hands full against the big-hitting Watson in a fluctuating contest. In the last eight, Kaymer had a one-up victory over Spaniard Miguel Angel Jimenez, Watson beat compatriot J.B. Holmes, Donald became the first player to reach the last four with a commanding 5&4 victory over American Ryan Moore and Kuchar beat South Korean Yang Yong-eun 2&1. Webb wins HSBC Australia's Karrie Webb used four straight birdies on the back nine Sunday to surge past Japan's Chie Arimura for a one-shot victory at the HSBC Women's Champions in Singapore. The 36-year-old Webb finished with a 3-under 69 for a 13-under total of 275 at Singapore's Tanah Merah Country Club for her 37th career LPGA tour win. Webb, who took home a winner's check of $210,000, was three strokes behind Arimura after a bogey on the 10th. But she started her string of birdies on the next hole to grab a lead she would never relinquish. Top-ranked Yani Tseng of Taiwan (67) jumped into contention with five birdies on the front nine, but couldn't keep up that pace and finished in third place, three shots behind the winner. Tseng was coming off a string of three victories in three weeks, earning the top ranking after wins at the Australian Women's Open and Australian Ladies Masters on the Ladies European Tour in February and last week's LPGA Thailand event. South Korea's Sun Young Yoo (69) finished fourth, five strokes behind Webb. American Morgan Pressel (68) was another shot back in fifth and Na Yeon Choi (71) of South Korea was sixth, seven strokes behind.