King Memphis did it again when booking his place in the semi-final of the Premier Greyhound Racing Kent Derby at Central Park. Elizabeth and Rab McNair’s English Greyhound Derby finalist equalled his newly-established track record when beating Paul Donovan’s Cinderella Tell and Patrick Janssens’ Crossfield Enzo in heat five last weekend, clocking 28.73sec. It marked a third successive victory at the Sittingbourne venue for the Olympic and Puppy Derby champion, who remains favourite to scoop the £20,000 first prize in the final on Saturday, October 19. The son of Queen Beyonce will need to fini…