BUDAPEST: Laulauga Tausaga obliterated her personal best by over four metres to take a stunning world discus gold on Tuesday just as fellow American and hot favourite Valarie Allman had been seemingly cruising towards the title. Tausaga, who finished last in the previous two world finals, came into the showdown with a best of 65.46 metres but somehow found 69.49 with her fifth throw, before sprinting into the crowd to celebrate with her incredulous supporters. Olympic champion Allman owned the top six throws of the season, the best of them almost three metres better than anyone else in the field, and was determined to avoid a repeat of last year when she was hot favourite but managed only bronze behind surprise winner Feng Bin of China. Unlike in Eugene, Allman stamped her authority on the Budapest competition with a first round throw of 68.57 metres – further than any of her rivals had managed all year.