Roger Federer said his career changed forever when he had knee surgery earlier this year.
Federer tore a meniscus during a mundane activity at home and was forced to have an arthroscopic procedure to repair it.
He later took six months off to fully recover and also allow his troublesome back to heal, and has admitted that his return was fraught with uncertainty.
“I knew my knee would never be the same, and I wasn’t sure if I was ever going to come back from that,” Federer said.
“Entering the Australian Open, I knew that even if I lost in the first round, and left healthy, that was a win for me.
“Right when it became most important I played my best tennis.
“I was just confident again. I think I was able to ride the wave.”
Maria Sharapova has hit out at the ITF for failing to inform players of their decisions.
The ITF are the gate-keepers of the sport and provide the rules and regulations for the ATP and WTA Tour.
But Sharapova claims the players are neither been involved in the decisions or told of the results.
“Tennis’s importance keeps getting bigger, and rightly so,” Sharapova told German newspaper Bild.
“But unfortunately, players are not involved in the conversations regarding changes.
“I learned about news for 2018 through the internet.
“It can’t be correct.”
Kei Nishikori will face a race against time to make the Australian Open next month after pulling out of the Brisbane International.
Nishikori reached the final of the tournament last year but struggled with a wrist injury that forced him out of the US Open.
And he could miss his second Grand Slam in a row after withdrawing from the popular warm-up tournament.
“I am so disappointed to miss Brisbane this year. For years it’s been my first tournament of the season and I always feel so at home there,” Nishikori said.