SA teenager refused bail for assault

A 15-year-old boy has been refused bail after allegedly seriously assaulting a 26-year-old man in Adelaide's south.

Police were called to an address at Edwardstown just after 4am on Saturday, where they found the Murray Bridge man unconscious in a driveway.

He was taken to the Flinders Medical Centre in a serious condition.

Officers arrested the Edwardstown teenager, who has been refused bail to face Adelaide Youth Court on Monday charged with aggravated assault causing serious harm.