ON A day of dramatic contrasts at Sha Tin, defending champion jockey Basil Marcus chalked up his 500th Hong Kong winner on his way to a brilliant four-timer while rival Douglas Whyte left the track with a one-day ban. Easter Saturday could turn into a pivotal day in the topsy-turvy championship battle. Marcus happily poured champagne after an unforgettable day in the saddle as he became almost certainly only the third jockey to ride a landmark 500 winners in professional racing history. Jockey Club information official, Leo Kwan, said: 'We are going through the records but it takes time. We do know there aren't very many.' The fickle nature of racing was summed up on a day that had looked rosy for Whyte. He looked capable of riding three or four winners and extending his two-winner lead at the top of the table. Now that lead has disappeared and he is out of next Sunday's Queen Elizabeth II Cup meeting. He was due to ride Oriental Express in the big race but intends to appeal against the suspension. Whyte said: 'I am disappointed. I was five-lengths clear and on top at the marker pole. I don't really understand why I am in this position.' The ban came for his breach of the rule when riding Holy Grail in the Juvenile Sprint Championship - his lone winner for the day on the 10-race programme. For Marcus, it was simply a case of everything going right. 'This is truly a day for me to remember.' said Marcus. 'Sometimes it just all falls into place and you have that extra bit of luck. I was pretty confident I could ride a double and getting 500 winners is very special. But to go on and get four winners was a real bonus,' added the South African. Brilliant Hong Kong International Bowl winner Catalan Opening yesterday won the $5.5 million Doncaster Handicap at Randwick in Sydney, coming from well off the pace under Lenny Beasley to score at the remarkable odds of 37-1. Trainer Bart Cummings, who has four previous wins in the event to his credit, said the five-year-old had thrived since his return from Hong Kong.