“This one stands alone, this is in its own category” – Roger Federer after claiming his 18th grand slam after a six-month hiatus.
“It’s just amazing the way that he’s playing after such a long time without being on the tour … congratulations” – beaten finalist Rafael Nadal.
“Roger Federer has solidified himself as the greatest of all time” – seven-time slam winner John McEnroe.
“6 months out and straight to win @AustralianOpen… we all aware what a insane feat that is?? at 35..#justchecking huge congrats to Federer” – Jamie Delgado, coach to world No.1 Andy Murray
“Everyone stop right now .. take 6 months off. Come back. Win ….. can’t believe what I watched. Congrats to my friend @rogerfederer” – 2003 Wimbledon champion Andy Roddick
“What a great and amazing match to wake up for. Thank you Roger, thank you Rafa. @AustralianOpen” – world No.3 Milos Raonic
“Congratulations @rogerfederer on Grand Slam win No. 18! As a huge fan of tennis and you, don’t stop there.” – 18-time golf major winner Jack Nicklaus
“Greatest of all time!” – Australian Test captain Steve Smith on Federer’s achievements
“Take 6 months off and come back and win a slam…… #GOAT” – world No.129 Denis Kudla.