World champion Theo Bos of the Netherlands won the keirin event from close rival and Olympic champion Ryan Bayley on the opening night of the UCI World Cup track cycling leg in Syndey on Friday.
Bayley was awarded the silver medal despite fellow Australian rider Mark French crossing the line in second place behind Bos.
French was relegated from second to sixth place after he was ruled to have caused interference two laps from the finish of the final, with former world champion Rene Wolff taking the bronze medal.
Bos made his move two laps from home and proved to strong, holding off strong finishes from the Australian pair.
Bayley was disappointed, despite winning the silver medal.
"I came into this keirin wanting to win, my condition was really good, the head going into it was really good but unfortunately I made too many mistakes and legs can't pull you from a mistake, that can't get you to the front," he said.
"Unfortunately, Theo ran a good race and unfortunately Mark French got disqualified.
"I don't like from third to second because of a relegation ... but at least I'm on the podium and I haven't been on the podium for a long time now."
Australian Katherine Bates scored a one-point win over Italy's Giorgia Bronzini in the women's points race.
Bates scored 13 points, ahead of Bronzini on 12, with China's Li Yan third with 10.
Olympic and World Champion Chris Hoy of Great Britain won the men's 1km time trial from compatriot Jason Queally.