Star three-year-old The Autumn Sun will stick to his own age group for his next start in the Rosehill Guineas but the door is still open for a clash with his champion stablemate Winx.

Trainer Chris Waller said in a statement on Wednesday, the colt had come through his Randwick Guineas win in fine shape.

He and the owners have decided to test The Autumn Sun at 2000m in the Rosehill Guineas on March 23.

"He has come through his victory in the Randwick Guineas without issue and recovered well from the run," Waller said.

"There were various options available for his next run, however it was agreed that stepping to the untested trip of 2000m will open up further race options for him during the autumn.

"No decision will be made on any races beyond the Rosehill Guineas as we look to use the race as a distance guide for any future races he may contest in the autumn and beyond."

Winx's last race is expected to be the Queen Elizabeth Stakes (2000m) on April 13, a possible target if The Autumn Sun proves himself at the distance.

The colt's owners are The Hermitage's Eugene Chuang and John Messara, the boss of Arrowfield Stud where The Autumn Sun will stand when his racing days are over.