Kokkinakis doubtful for his match on Monday: "I don't know how I'll feel".

Thanasi Kokkinakis, quarter-finalist in Adelaide last week, had to withdraw before his match after playing two marathon matches in the previous rounds.

Playing his Australian Open 1st round match against Roman Safiullin at the Kia Arena on Monday, Kokkinakis told a press conference that he wasn't 100% sure of his fitness: "Honestly, I've felt better in the past. I'm frustrated. Withdrawing last week wasn't easy.

I don't know how I'll feel on Monday, I've still got a few things to work on. I'll leave it there, I don't know what else to say.

It's a bad feeling to have when you're preparing for one of the most important events of the year."