Haradasun is a brown horse sired by Fusaichi Pegasus (USA) from Circles of Gold (AJC Oaks) by Marscay.

Haradasun looked to be a real contender for the 2006 Melbourne Spring Racing Carnival but his trainer, Tony Vasil, noticed he was slightly lame in one leg after he had cooled down one morning after track work.

In next month, he finished fourth to Miss Finland in the Australian Guineas, won the George Ryder Stakes at Rosehill in Sydney before winning the Group 1 Doncaster Handicap mile at Royal Randwick.

He looked on track to win the Queen Elizabeth Stakes, but he was beaten into second place by two lengths by the Gai Waterhouse trained Desert War.

Coolmore Stud, an international breeding company, bought a half share in Haradasun for $20 million,[3] and they replaced Rawiller with Damien Oliver, for the rest of the 2007 season.