AUSTRALIAN star Darren Gauci's topsy-turvy season moved back into top gear at Sha Tin yesterday when he produced a quality 28-1 double that took him to the 14-winner mark for the season. The former Melbourne champion, one of the most polished riders it is possible to see during a race, won on Link Treasure (4-1) and took the final event on Optic Empire (7-1) after a thrilling duel with bottomweight Magnified (6-1). It has not exactly been roses all the way this season for Gauci who started with a bang but has had a number of quiet spells since September. But it came right yesterday for the likable Victorian, and Link Treasure also provided another winner for first-season trainer Steven Leung who is making his presence felt. Although Link Treasure won the Class Three fifth event quite readily, the real excitement came in the last race. Betting on the 12-runner Classes One and Two event was absolutely wide open with Saboatan going to the post a distinctly uneasy 5-1 favourite. Two points separated five other runners. It was a race full of chances and Irish champion Mick Kinane looked for a few strides as if he had nicked it when darting along the cutaway rail on the dreaded D Course to take a half-length lead. But Gauci, who was in the centre of the track and did not come off a straight course, wound Optic Empire right up and they came well over a length clear of a weakening Right Way. Optic Empire won by a short head but it was a sterling effort as he was conceding the runner-up 19 pounds. Gauci said: ''It was a brave win because Magnified got in front of me and I had already used Optic Empire up to get there. But he answered up again when I went for him and it was a really tough win. He showed a lot of guts.'' Right Way finished third a length and a quarter away and Marshall said: ''You couldn't ask for much more. He was carrying 139 pounds and drawn in the extreme outside. It was a really game effort.'' Mount Hansen (6-1) finished fifth without threatening and All Thrills (7-1) faded for 10th. Link Treasure provided Gauci with a much easier win when scoring by a length and a half over 1,200 metres. He was simply cruising off the pace for the Australian and came sweetly clear in the straight with the minimum of fuss to score from veteran Active Bobo (7-1) who responded to the urging of Tony Cruz to just edge Super Bingo II (5-1) out of the quinella close home.