By Wally Pyrah IT WOULD be fair to say that jockey Zac Purton could do with a pick-me-up after a pretty ordinary weekend in Hong Kong. After riding only one winner from his nine rides at Sha Tin last Sunday – three of which were beaten favourites – the reigning champ also found out he had lost the ride on the world’s top sprinter, Lucky Sweynesse, following their defeat in the Centenary Sprint Cup at Sha Tin the previous Sunday. Having ridden the five-year-old to 11 of his 15 victories, including three Group Ones, it seems a heavy price to pay for a galloper who was subsequently found to be la…