How the world reacted to Roger Federer's 18th grand slam title.

"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.

As it happened: Roger Federer v Rafael Nadal, Australian Open final

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"Roger Federer has solidified himself as the greatest of all time" - seven-time slam winner John McEnroe.