Djokovic is undoubtedly back, the 31-year-old rediscovering his mojo in winning Wimbledon and the US Open in 2018 to regain the No.1 ranking and top seeding status for the Open. He will continue playing through the Australian Open, noting, "I can still play to a level, not a level I'm happy playing at".
"What I can say is the off-season was great for me".
"I feel when she's playing at her best, she's the best player in the world", he said.
Federer, aiming for his 100th career title, will open against No 99-ranked Denis Istomin on Rod Laver Arena on Monday, likely after Murray has taken on No 22-seeded Roberto Bautista Agut on Melbourne Arena.
"Then, of course, after surgery, after months without competing, having troubles to practice, of course there is always issues when you come back".
Murray, who became the first British player in 77 years to win the men's singles title at the All England Club in 2013, is retiring from tennis this year due to continuing pain in his hip.
Former world number one Murray is being forced out with a hip problem and a body wracked with pain - and Federer is desperate to go out on his own terms. "You will always be someone that impacted the sport in so many different ways", wrote Kyrgios on Instagram. It's hardly surprising that we're hearing this, when less than 3% of people shown playing sport in national newspapers are women.
Andy Murray has announced his retirement.
"He's a good guy, Hall of Famer, legend. I feel like I'm hitting the ball well", she said.
For me, I've got Novak facing off against Kei in the quarterfinal, and - given his track record against the Japanese player (15-2 over the years) - I've got Novak advancing through to the semis. "Obviously it was something that I really wanted, a big dream of mine to win a grand slam, and it was an unbelievable feeling and an incredible two weeks".
"For me, it's just all the time making sure I get good massaging, good treatments, ice baths, stretching, do everything even more thoroughly than maybe in the past", she said.
Norrie comes into the tournament having reached his first ATP final in Auckland last week, although he lost to American Tennys Sandgren in straight sets. "I need to speak with Novak, Rafa (Nadal), and Andy (Murray) a little bit just to get their take on it all".
Murray has interests away from the court and a young family, but admitted: "Once I'd started thinking about stopping, all of the things that I thought I would quite like to do, I have zero interest in doing right now. To me, he has been undervalued as a man, not as a tennis player".