Australia's champion sprinting mare Black Caviar has thrown down the gauntlet to Sacred Kingdom after taking her record to eight wins from eight starts in the penultimate leg of the Global Sprint Challenge at Melbourne's Flemington racecourese yesterday. With regular rider Luke Nolen suspended, youngster Ben Melham was given the job of guiding the Peter Moody-trained Black Caviar in the Patinack Farm Classic, but it made no difference as she coasted to her first Group One victory. A showdown with Australia's other boom sprinter, Hay List, was a fizzler with the latter clearly well below form after an accident that required five stitches to a leg wound setting him back in the lead-up to the race. He finished sixth of the seven runners, while Black Caviar put on an exhibition that may see her elevated officially to the status of world's top sprinter after next month's Cathay Pacific Hong Kong Sprint. Racing Victoria handicapper Greg Carpenter said Black Caviar would almost certainly be promoted to 'champion sprinter of the world'. Carpentar said the mare's performance would likely see her rated 123 internationally. That would take her past Hong Kong's established world champion Sacred Kingdom (122) and Irish-based, Australian-bred Starspangledbanner (121), even without the allowance Black Caviar's rating receives because she is female. Neither Black Caviar nor Hay List is scheduled to come to Hong Kong's showpiece on December 12, so Sacred Kingdom would have to do something spectacular to increase his rating and retain his throne. Meanwhile, Macau racing went close to a red-letter day with Luen Yat Forever being beaten only a head margin into fourth place in the Group One Emirates Stakes. Many eyebrows were raised when Luen Yat Forever was shipped out to Australia's major racing festival, but Macau's top galloper has been far from disgraced against the top shelf in Melbourne. He was beaten only just over a length into fourth in the Group One Toorak Handicap last month at Caulfield and was even closer behind New Zealand's best horse, Wall Street, yesterday after looking a chance to win the race in the final 150m.