Trainer David Oughton's greatest fear is the unknown as nominal Hong Kong Derby favourite Bowman's Crossing seeks his first Group One win in today's $8 million Classic Mile at Sha Tin. 'Bowman's Crossing is a terrific horse to train and I've been very happy with him since he won last time. He's very well,' Oughton said yesterday. 'Even though that race was 1,600m, I feel it is nevertheless a touch on the short side for him and so that is a little query. Other than that, I do feel he probably has most of them covered - the ones we know, anyway. 'If I'm worried about the opposition, then I have to say I'm most worried about the ones which have had only one run. You just don't know how much they are going to come on for that first start here.' Those 'unknowns' are Beverly Green, Jazz Beat, River Dancer and Elegant Fashion. The David Hayes-trained Elegant Fashion's debut win over Raider and Century Star was confirmed form after the Chinese New Year meeting where those two horses quinellaed a race and the Lawrie Fownes-trained Jazz Beat has trialled very strongly since finishing five lengths behind in that event on his debut. 'I'm very happy with Jazz Beat,' Fownes said. 'He's probably looking for more like 1,800m or 2,000m but his work and trial have been encouraging. His coat looks good and he seems to be acclimatising quickly and going the right way.' Fownes said Jazz Beat's one advantage was with a gate four draw: 'He is versatile enough to race handy or sit back if they run along quick, so he should have a nice position and, hopefully, give us a glimpse of a Derby run.' Championship leader John Size said he would opt for River Dancer as the best of his three runners and the former Irish horse 'feels like he has progressed'. He said: 'My other pair, Gift and Dynamic Fun have both made good progress so far this season, but even when they're racing well and on the rise, you wonder how far they can come in the one campaign. On the other hand, River Dancer came here on a high rating and does seem like he is going forward. It may be that 1,600m is still too short for him but I haven't had the horse long enough to say that is definitely the case and we'll learn more from this race.' Hayes said he was expecting a strong show from Elegant Fashion, despite drawing the widest gate. 'She's very good, very genuine and I'm expecting that she will run well. Her work's been solid and she had a nice barrier trial the other day,' Hayes said. 'She doesn't have to get back but from a bad draw first time out she did drop to the tail and won. From the outside again, we are probably obliged to give her a chance but there seems good speed in the race.' Hayes said the mare's next task would be determined by her performance today and how she comes through the race, as she may back up next Sunday in the Hong Kong Gold Cup. 'I would like to get a tough 2,000m race into her before the Derby and at her level the only one available is the Gold Cup. Obviously, that will depend on how she comes through this race but, ideally, that is the plan I have.' Hayes' dark horse today is the former smart Irish horse Beverly Green, who ran solidly in his Hong Kong debut behind Century Star over 1,400m at the Chinese New Year meeting. 'His work is a bit better each time and he has definitely come on from that first run. Beverly Green is a likely improver today but in all honesty his preparation has been a bit rushed,' he said.