Perennial leading jockey Zac Purton fired in a six-timer Sunday at Sha Tin, his best day in 15 months, but he was unable to sweeten the deal in the G1 Centenary Sprint Cup. Lucky Sweynesse (NZ) (Sweynesse {Aus}), the newly crowned world's best sprinter, was the $1.35 jolly to follow up on his victory in the G1 Longines Hong Sprint Dec. 10, but he was slow through the early stages and it ultimately spelled doom, as Derek Leung walked the dog astride Victor the Winner (Aus) (Toronado {Ire}) en route...