About 8.40pm, emergency services were called to the intersection of Roberts Road and Amarina Avenue, where a motorcycle and car had collided, causing the Audi to spin and the rider to be thrown from his motorcycle,
The rider, a 24-year-old man, was treated at the scene by paramedics before being taken to hospital for further assessment and treatment.
The driver of the Audi, a 20-year-old man, was breath-tested at the scene and returned a negative reading.
As part of inquiries, police are seeking witnesses to the crash, or anyone with dashcam footage to contact Auburn Police Station or Crime Stoppers on 1800 333 000.
Hunt for accident witness
POLICE are appealing for assistance as they investigate a crash in Greenacre last Wednesday night.