#4 Rod Laver (1969)
Whenever the talk of 'GOAT' arises, Rod Laver's name will invariably crop up. It is not without a reason though. Laver has won 11 Grand Slam titles and completed the Calendar Slam twice.
He is till date the only man to have won the Calendar Slam in the Open Era. Laver was barred from competing in Grand Slams for five years prior to 1968. Had he been allowed to compete, the trio of Federer, Nadal and Djokovic would still be chasing his tally.
Laver came into the 1969 US Open as the top-seed. He faced third seed and compatriot Tony Roche in the final. Laver won the match in four sets to win his second US Open crown at the age of 31 years, 31 days.
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