China ended the opening day of the Centennial Olympics on a glittering note, topping the medal table with two golds and two silvers. World champion Le Jingyi grabbed gold in the women's 100 metres freestyle, but three other much-vaunted Chinese women swimmers failed to make even the finals in their events, despite having some of the world's best times. China's other gold came from judoka Sun Fuming , who won the women's over 72-kilogram class. Germany, without any golds, has two silvers and three bronzes to lead in total medals. The US has two silvers and a bronze. Chinese satisfaction of leading at the end of the first day was tempered by the knowledge they could have fared better. Former Olympic champion Wang Yifu let slip a certain gold in the men's 10-metre air pistol event. He was taken away on a stretcher after collapsing in tears when a disastrous final shot robbed him of his title. He was examined by paramedics before the International Olympic Committee's chief medical officer said the 35-year-old had probably collapsed due to the heat. In men's gymnastics, China lost the lead late in the day's final session after a weak showing on the rings. A damaging blow to their chances came when world champion Li Xiaoshuang slipped and put his right arm through the ring when his hand protector broke as he moved into an iron cross position. Li, a favourite to win gold, scored a lowly 8.350 and also stumbled on his floor dismount to stand a shocking 29th. The top 36 qualify for the all-round finals. Jeered into the Olympic Stadium for the opening ceremony, the Chinese athletes have missed out on that southern hospitality Atlanta prides itself on. The team's welcome in the Olympic Village has also been less than warm. When two of their top swimmers failed to qualify and left the pool in tears, swimming coach Zhou Ming revealed that a series of false fire alarms had been set off at their building in the village. 'There have been three false alarms, but the worst occurred at 2 am today while all the swimmers were asleep,' Zhou said. The Chinese - and members of the Hong Kong squad, who are billeted with the mainland athletes - had to evacuate the building and stand outside for more than an hour. The favourites for gold and silver in the women's 400 m individual medley, Chen Yan and Wu Yanyan, finished 17th and 18th respectively in qualifying. The 400 m individual medley favourite Shan Ying failed to make the final. Only 100 m freestyle world record-holder Le managed to live up to her pre-Olympic billing. But when Le went through doping control there was a delay, prompting reporters to ask other swimmers if they suspected the Chinese were using performance-enhancing drugs, a rumour that has dogged the team since it logged seven positive test results in Hiroshima in 1994. As she emerged, Le angrily rejected the accusations. 'We were tested before the Games. At least four times a week. It's like slander.' Frederik Deburghgraeve of Belgium set a world record of one minute 00.6 seconds in his men's 100 m breaststroke heat. He went on to win gold. The Games' second world record fell to Turkish weightlifter Halil Mutlu who broke his 54 kg snatch best with a lift of 132.5 kg. Ireland and New Zealand collected their first-ever Olympic swimming golds, Michelle Smith and Danyon Loader winning the women's 400 m individual medley and men's 200 m freestyle respectively.