AUCTION ring fireworks are expected at Wrightson's New Zealand National Yearling Sales which start at Karaka on Thursday. And it is Hong Kong money which could well ignite the bidding bonfire with a number of the territory's leading racing personalities already in Auckland for the sales with others, such as runaway championship leading trainer Patrick Biancone, flying out of Hong Kong tonight. Wrightson expect a buoyant market following the recent success of the Magic Millions sale on the Gold Coast, and they put much of this down to the presence of the big-spending Hong Kong owners. The relaxation of purchasing restraints on owners which were previously imposed by the Royal Hong Kong Jockey Club has been a particularly important development. The managing director of Wrightson Bloodstock, Joe Walls, said: 'The strength of the Asian buyers will be stronger than ever at this week's sales. 'They used to come here with a ceiling on how much they could spend on any given yearling. 'Now they don't have any limit and that means they can compete more effectively at the top end of the market against all the big buyers from anywhere in the world - and compete they do.' Biancone has done well with some New Zealand-bred horses in his time in the territory. 'I will be leaving tomorrow night and am very interested in a number of yearlings on offer,' he said yesterday. 'Some of the New Zealand horses take time to mature but they also produce some very good looking, tough animals and there can be value down there for my owners.' This year's premier sale will have 520 yearlings on offer from 65 individual stallions.