Lake Illawarra police are calling for witnesses after a man was victim to a one-punch attack at Kembla Grange Racecourse late Saturday afternoon.
Police say the 42-year-old got involved in an argument with someone at the Turf Club around 4:20pm.
The man was then punched and fell to the ground, hitting his head badly.
Paramedics attended the scene and took the man to Wollongong Hospital where he remains in a critical condition.
Anyone with information is urged to contact Lake Illawarra police or Crime Stoppers (1800 333 000).