A 26-year-old man from Bertram has been charged with one count of grievous bodily harm.
The incident happened at the Whistling Kite on Oasis Drive around 11pm on Friday.
Police say the victim was approached by a man, when a brief conversation took place.
The victim was then allegedly punched to the face, causing him to fall to the ground.
The alleged offender left the area and the man was taken to Rockingham Hospital with serious head injuries.
The 26-year-old is due to appear in Rockingham Magistrates Court on March 22.
City of Kwinana proposes 4.5 per cent rate rise
Recreational boat fishers offered $50 rebate for fishing gear at participating tackle shops
Waikiki teen among the best CrossFit athletes in the world
Mandurah's Kerrie Overell crowned WA Volunteer of the Year
Wellard home destroyed by fire
Woman fined $7k after catching 134 undersize crabs in Coodanup
Mandurah mayor Amber Kearns 'disappointed' in councillor Peter Rogers' decision to resign
Speed limit dropped to 70km/h on stretch of Mandurah Road in Secret Harbour
WA Police officer tragically dies in hospital days after Hopeland crash