The American, who coached the 19-time Grand Slam victor between 2010 and 2013 after being in Pete Sampras' corner, believes that despite recently turning 36, you can never write-off the Swiss because he is such a special talent.
"I can't stop laughing outside and inside".
"This whole tennis thing is kind of getting to me", said Aiava, who is ranked world No.193. "I wanted to be back on court, unfortunately the elbow wouldn't let me last week".
The Australian Open, the first Grand Slam of the year, is set to get underway on January 15, with the men's singles title match set for January 28.
Former world number one Novak Djokovic has said that he intends to play in the 2018 Australian Open starting next Monday.
"This has been a tough period for me, obviously injury is the greatest enemy a professional athlete can have", the Serbian added.
Should Djokovic come through that, he could face France's former world No 6 Gael Monfils, who enters the Australian Open as the recently-crowned Qatar Open champion - a tournament Djokovic has twice won but opted to miss this year to continue his recovery. "It's a great start". "If I am not feeling good, probably I wouldn't be here so that's good news", the 16-time grand slam champion told Channel 7.
Williams said that despite the physical stresses from having a baby, she was in a far better place mentally than she'd ever been throughout her career.
Djokovic will play two matches at the Kooyong Classic exhibition event as he recovers from the elbow injury that has kept him out of action since July.
However, the Swiss star, 36, was cautious about predicting a repeat victory.
The Australian Open is the second straight Grand Slam to be badly hit by injury issues. I take it the right way.
She said that while she was pleased with her recovery and her progress, she was "not where I personally want to be". After last year's throwback season and 12 months on from his remarkable feat in Melbourne, there is nothing to suggest Federer will be in anything less than top shape at a tournament he has won five times.
STAN Wawrinka will test his left knee in the Tie Break Tens at Melbourne Park on Wednesday night, warning he will bypass the Australian Open unless there is "zero risk" of jeopardising long-term goals.