Jockey Ben Melham has been hospitalised following a fall at Caulfield Heath.
Racing Victoria stewards reported Melham suffered a suspected leg fracture after parting ways withHeed The Deed in the Stow Storage Solutions Handicap (1600m).
Heed The Deed jumped with the field, but appeared to shift out abruptly, dislodging Melham, before the riderless horse crossed the line in front of official winner Chihuly.
Fiancée Jamie Kah rushed to Melham's side after weighing in aboard the seventh-placed High Five.
Melham missed racing over summer after undergoing surgery on a problem hip but had been riding in good form since his return, including victory in the Australian Cup at Flemington on Cascadian last month.
Melham was due to ride at Pakenham on Thursday night before flying to Perth on Friday for The Quokka meeting at Ascot on Saturday.