Thailand's Thaworn Wiratchant hopes to wrest the lead from compatriot Thongchai Jaidee in the race for the Asian Tour Order of Merit at this week's Macau Open. Wiratchant is only US$6,526 behind Thongchai after he finished fourth in the SK Telecom Open in South Korea on Sunday. Thongchai heads the rankings with US$269,182, thanks to a repeat victory at the Carlsberg Malaysian Open in February and he is now focusing on his campaign in Europe. Thaworn, winner of the Enjoy Jakarta Standard Chartered Indonesia Open in March, has already accumulated US$262,656 and heads to Macau in good form after finishing six shots behind K.J. Choi in Seoul, which came with a cheque of US$24,000. Thaworn, who finished second last year with a closing 65 at the Macau Golf and Country Club, feels the time has come to mount a challenge for the merit title this season. 'To win the Asian Tour Order of Merit is a big goal of mine,' said Thaworn, a five-time winner in Asia. 'If I keep playing well, I can catch Thongchai within the next few weeks.' India's Jyoti Randhawa, who did not play in Seoul, Open, remains third on the Order of Merit with US$184,120. Scotsman Simon Yates, whose title defence in Korea saw him finishing sixth, broke into the top-10, moving up from 15th place to eighth. He earned US$16,300 and increased his season's tally to US$85,928. One of the biggest movers was Australian rookie Andrew Buckle. He enjoyed a tied second finish alongside former US Masters winner Fred Couples and earned US$40,000 to leapfrog into 21st place. The sweet-swinging Couples will remain in Asia this week and make his debut in Macau, an event which has previously attracted marquee names such as Vijay Singh, Lee Westwood, Mark O'Meara and Padraig Harrington. The popular American, winner of 15 US PGA Tour titles, will be joined in Macau by Chinese number one Zhang Lianwei, a two-time winner of the event, as well as title-holder Jason Knutzon. The US$275,000 Macau Open is the 12th leg of this season's Asian Tour.