They don't come much busier than yesterday's Sha Tin session with wave upon wave of workers prior to the eight grass trials. Big things are predicted for esteemed local trainer Alex Wong Siu-tan and his new stable jockey, the top Australia-based rider Larry Cassidy. Wong not only has his biggest string for some time he also has the highest quality string he's ever assembled. None was on display during yesterday's trials but a number have been working along solidly and Wong's English import from last season, Lik Rambo, has matured into a lovely looking individual. He wasn't asked to do anything much yesterday morning but the way he breezed round suggested he could well be up to winning good races in Class One. Ricky Yiu had a brilliant first campaign, sending out 20 winners despite starting out on his training venture with just nine old crocks. Nothing succeeds like success in this racing jurisdiction and he found owners clamouring to join him. Auto-Matching and Option are two of his more recent and better acquisitions, making the short journey across the Sha Tin stabling complex after Neville Begg retired. Yesterday Yiu galloped them together with Auto-Matching showing the greater zip as they came through 800 metres in 53.0 seconds. Option is the type to go well fresh but it could be that Auto-Matching is the better handicapped of the pair, having returned to a mark of 92. He ran from a 97 when a highly creditable three-quarters of a length second to Supreme Goliath last season, before losing his way thereafter.