Rod Laver saluted Roger Federer's feat of winning a 15th Grand Slam as "an unbelievable effort".
Rod Laver saluted Roger Federer's feat of winning a 15th Grand Slam as "an unbelievable effort".
But Australian Laver, who won two calendar Grand Slams during his distinguished career, stressed it was impossible to compare players from different eras.
Federer (27) broke the record of 14 career Grand Slams, which he shared with Pete Sampras, to become the most successful player of all time.
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"He's just naturally talented and can change where he has to change. It's an unbelievable effort to have 15 Grand Slam titles.
"Pete Sampras has got 14, which was an unbelievable effort right there."
Laver won 11 Grand Slam titles but from 1963 to 1967, during his peak years, was prevented from playing at Wimbledon, the Australian, US and French Opens, which were only open to amateurs.
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