We'll know after today if Brett Prebble is a serious challenger to Douglas Whyte for the title of the champion jockey, as the Australian horseman has a quality book of rides at Sha Tin from which he may well land multiple winners. The Whyte-Prebble showdown is proving to be a much stronger contest than anyone imagined as Whyte, aka the Durban Demon, has ruthlessly pushed all would-be contenders aside for the past five seasons. But as of this morning, his margin over Prebble is just five wins, on a 62-57 scoreline. The highly-competitive Prebble now has Whyte in his sights and while he's cleverly avoided a verbal challenge to the incumbent titleholder, the signs are strong that the two-time Melbourne champion is rallying for a powerful thrust of the final months of the season. On today's programme, each of them has nine rides on the 11-event card but it's Prebble who has the superior book on paper. Shangdong General, Medic Power, Rocket Power, Absolute Champion, Hurray Hurray, Triumphant Diamond and Fuji Sunrise all look to have winning chances, and Prebble's other two mounts - Wafer King and Elegance Lucky - are not without a shout in their respective races either. Whyte's book of rides has an element of mystery about it because he's on four horses that have never raced here - Magic King (race one), Asian Citrus (race three) Cosmo Successor (race five) and Maribeau (race nine). Each of them looks to go nicely and has the potential to be winning races, if not today then very soon. But Maribeau, winner of three races in South Australia, looms as a most interesting runner, the first starter of former champion trainer Ivan Allan in his new role as an owner.