Eric Saint-Martin will ride Forest Spring for Patrick Biancone in Sunday's $6.5 million Hong Kong Derby. Forest Spring is the stable's important second string to the likely raging favourite Johan Cruyff, but Biancone has never had any doubts about the ability of the Select Sale griffin. 'He is a very good horse and I am sure he will run very well in the Derby. He has shown before how good he is and he has earned his chance in the Derby,' said Biancone, who was keen enough on the horse's chances to try to get world class rider Olivier Peslier here for the 1,800-metre Classic. That failed to find favour with the Licensing Committee and Biancone has turned to compatriot Saint-Martin, who will be looking for a change of luck. The French rider left the track on Saturday shaking his head and saying: 'I have not had a winner in February. It certainly has not been a good month for me.' Forest Spring has been ridden in several races by South African jockey Robbie Fradd, but he is required for Multi-Star, from his retaining stable of Ricky P. F. Yiu. Biancone is purring over the progress of Johan Cruyff, whose demolition job on the Classic Trial field over 1,600 metres at the start of the month is likely to make him the hottest Derby favourite in years. The Irish Derby fourth placegetter cantered yesterday and both he and Forest Spring will do fast work on the grass tomorrow. Biancone said: 'I am very, very pleased with the way he has gone since the Classic Trial. The work programme was mapped out for him and he has done everything exactly as I wanted him to do it. 'They will work [tomorrow] and all should be exactly right for Sunday,' he added. With six winners in two days Biancone is now the clear challenger to leader David Hayes, whose lone winner on Saturday - Golden Decade in the opener - keeps him five ahead of the Frenchman. And Biancone plans a real assault on the glamorous Derby Day card. 'At this moment I plan to have nine runners. The horses are running well and we are hopeful about Sunday,' he said.