'I am not going to relax in the remaining stages but try to extend the difference' Hong Kong extended their lead in the Tour of South China Sea yesterday as Wong Kam-po won stage five in Jiangmen, his third stage success so far. The 32-year-old displayed a high level of fitness as he braved strong gusts to win the most physical stage so far - a 105km criterium and an 8.4km upslope - in two hours, 24 minutes and 33 seconds. Taiji Nishitani of Japan and Nathan Jones of the City of Perth Cycling team were second and third respectively. Wong has been almost unstoppable so far on the eight-day tour. His first victory came in Shenzhen on Tuesday and he repeated his success in Guangzhou just two days ago. His teammate, Wu Kin-sun, also did his part to keep Hong Kong in top spot with his two wins in Hong Kong and Foshan. Wong, the four-time champion who last won in 2001, stayed up with the leading foursome as he started the undulating course in Baishuidai Garden. While other riders started accelerating once they reached the hill, Wong saved his energy until the last two kilometres and unleashed his power in the last part of the stage. 'The main reason for my victory was that I didn't try to lead in the hills,' Wong said. 'I changed my strategy from the lesson I learnt at the last National Games, which was, I sped up too early on the slope. I sought to follow the group closely [yesterday] and only started sprinting when there were two kilometres remaining.' Asked if he was more confident of claiming his fifth title after yesterday's victory, Wong said he would remain cautious, especially in the winner-takes-all Macau stage. 'Although Wu and I are first and second-placed overall, our time advantage over the fourth-placed rider is still less than two minutes,' Wong said. 'Anything can happen in a road race, especially going uphill, like the really steep slope in Coloane. I am not going to relax in the remaining three stages but will try to extend the time difference.' The 22-year-old Wu, who finished eighth in yesterday's stage, retained his yellow jersey and was heading Wong by seven seconds. Xu Gang, from the joint team of Shanghai and Hong Kong Sports Institutes, was a further one minute and eight seconds behind Wu. Japan's Nishitani said he was more than pleased with his second-place finish yesterday. 'I was feeling unwell and have been coughing since the last Asian Championships in India three weeks ago. It has been comforting to finish second today and third two days ago,' said the 24-year-old, who only lost to Wong by two seconds yesterday. He said he was still optimistic despite his illness. 'I am an all-round rider and adapt to both flat and hilly courses.' The tour continues today in Zhongshan with a 103km road race - 22-lap criterium - in Nantou.