Thanasi Kokkinakis has withdrawn from the Australian Open singles due to his shoulder injury, but remains hopeful of playing in the men's doubles alongside Nick Kyrgios.
Kokkinakis was forced out of the Adelaide International this week after a shoulder complaint flared during his first-round win over American Sebastian Korda.
The match was the 29-year-old South Australian's highly anticipated return to singles action after nearly 12 months away following pectoral surgery last February.
The radical surgery involved having an Achilles tendon surgically knotted between his right pectoral muscle and shoulder.
Kokkinakis said the latest setback was unrelated to that injury but on medical advice he pulled out of the Open singles, which gets underway Sunday.
He had a protected ranking to enter the singles at Melbourne Park.
"Unfortunately after speaking with my team and doctors I have made the decision to pull out of the Australian Open singles," he wrote on social media.
"After an incredibly tough year this was the event I was looking forward to the most but I'm not ready yet.
"I'm doing everything I can to be back to 100 per cent.
"We will still try and step out for the doubles and have some fun."
Kyrgios earlier also ruled himself out of singles while on the comeback trail after multiple injuries restricted the 30-year-old to just seven singles tour matches over the past three years.
