John Singleton and Gai Waterhouse in spectacular bust-up at Randwick AUSTRALIAN racing's most famous partnership came to a spectacular end at Randwick after owner-breeder John Singleton vowed to part ways with trainer Gai Waterhouse. In an explosive outburst after the duo's glamour mare More Joyous flopped in the Group 1 All Aged Stakes (1400m), Mr Singleton claimed to stewards that Tom Waterhouse, Gai's bookmaking son, had told "good friends of mine" the horse couldn't win. Her son Tom Waterhouse is the biggest bookmaker in Australia ... who told mates of mine, who I trust and have known for 20 years, (she wouldn't win). Tom Waterhouse vigorously denied the allegation both to The Sunday Telegraph and to his mother Gai, who relayed her conversation to racing stewards. "I rang him after the race with John Singleton's assertions," Mrs Waterhouse told chief steward Ray Murrihy. I said, 'What did you say?', and he said, 'Nothing was said, Mum'. If anything, I backed the horse, and it was a $300,000 difference to me. I was on More Joyous to win the race'. More Joyous drifted in betting from $2.50 to $3 and finished seventh, beaten by nearly four lengths by race favourite All Too Hard. An angry John Singleton threatens to remove his horses from the stables of trainer Gai Waterhouse after alleged conflict ofinterest Vision: 7TWO/TVN After the loss, a furious Mr Singleton shook his head in the mounting yard and immediately declared he would sack Mrs Waterhouse as trainer of all his horses. "That horse shouldn't have run," Mr Singleton said. "Tom should shut up, and (my racing manager) Duncan (Grimley) and I will find a new trainer."Gai is finished. I think Gai is a genius, but Gai and Tom ... they're not for me any more. Later he said: "Tom has been saying she (More Joyous) has got problems and I don't know about them. It's too much. It's a conflict of interest. When I hear the horse has got problems and I don't know about it, it's wrong. In the mounting yard, Mrs Waterhouse walked towards jockey Nash Rawiller but refused to look at Mr Singleton. Mr Singleton glared at Mrs Waterhouse, waved his hand and shouted: "Goodbye, Gai." Mrs Waterhouse offered a stern "no comment" to the The Sunday Telegraph. Tom Waterhouse last night said Mr Singleton was wrong. I did not tell anyone I didn't think she could win. The emotional statements are not only totally inaccurate and untrue but also defamatory," he said. Mrs Waterhouse and Mr Singleton faced each other late yesterday in a stewards inquiry, where Mr Singleton continued with the stunning allegations. "I told Gai the horse has got a problem, and Tom Waterhouse told a Group 1 jockey friend of mine, and a number of guys I've known for 20 years, the horse had 'problems', and she can't win," Mr Singleton told stewards. Mr Murrihy challenged Mr Singleton to reveal names, but the advertising guru and radio network owner refused. "If I'm legally obligated I will do that, but I'm not prepared to give them up," he told stewards. All my horses are leaving the stable tomorrow. John Singleton and Gai Waterhouse leave the steward's room after More Joyous' unplaced run. Picture: Jeremey Piper But Murrihy replied: "There's not much weight on racecourse tattle if people don't stump up. Millions of dollars are being invested on the race and we need to get to the bottom of this and find out if Tom Waterhouse is being misrepresented in this. Mrs Waterhouse told stewards she would not have started the horse, her star mare, had there been any doubt about her form.She said the mare had been treated with an antibiotic on Thursday for heat in her neck, a problem both Mr Singleton's vet John Peatfield and stable vet Leanne Begg considered minor. Peatfield examined the horse on Saturday morning and said she was fit to race. "We had two vets look at her and they couldn't find anything amiss, the rider couldn't find anything amiss and I couldn't find anything amiss," Mrs Waterhouse said. Murrihy asked: "Why didn't you advise stewards there might be an issue?" Mrs Waterhouse replied: "Because there wasn't an issue." A second stewards hearing, for all of the Waterhouses and Mr Singleton, has been set down for this Friday at 2pm.