SINGAPORE (AFP) - Chinese women's world number one Wang Shixian overcame a tough challenge from German Juliane Schenk at the Singapore Open badminton tournament on Friday to advance to the semi-finals. The reigning All-England champion showed her class and grit after losing the first set 17-21 to come through 21-15 and 22-20 in the last two sets. "I just tried to cut down on my mistakes in the second game," Wang said afterwards. "Losing did cross my mind but I just tried to be patient and play it point by point," the 21-year-old said. Wang won the second set when her served was judged wrongly by the German to be going out, taking the match to a third set thriller which was closely fought all the way to the end. The Chinese champion had to call on all her resources to stave off her spirited opponent with lightning fast smashes and drop shots to finally win the quarter-final. The number one seed took the final game to deuce at 20-20 with a winning smash after trapping Schenk at the net with a delicate drop shot, before sealing her victory with another irretrievable smash. "I knew it was going to be tough," said Schenk, who was proud of her showing despite losing to her more illustrious Chinese opponent. "She is number one... today everyone tried their best, maybe she speeded it up a little more (after losing the first game)," she said. In the men's side, rising young Chinese men's player Wang Zhengming beat reigning Danish world junior champion Viktor Axelsen in straight sets 21-15 21-10. "Prior to the game, I watched videos of matches that Viktor played in to analyse his play," said Zheng. "That helped me to prepare and my strategy was to restrict his movement," said the 21-year-old. Zheng, who has been touted as a future Chinese star and possible successor to the great Lin Dan, said he preferred to concentrate on improving his game. "Lin Dan is irreplaceable but I hope to follow in his footsteps," said Zheng. "I think I have to be more focused on my game and not let what outsiders say affect me," he added. Singapore is the fifth stop on the 12-leg Super Series tour, with the top eight men, women and doubles pairs reaching the finals in December.