Novak Djokovic was pretty close to pulling this one off in 2011, but he missed the French Open.

Since the Open era began, only three players have achieved the "Grand Slam," or winning the Australian Open, French Open, Wimbledon and the U.S. Open in the same year: Rod Laver, who accomplished it in 1962 and in 1969, Margaret Court (1970) and Steffi Graf (1988).

Bobby Jones was the only pre-Masters-era player to register a career grand slam. In the Masters era, a select group of five—Jack Nicklaus, Tiger Woods, Ben Hogan, Gary Player and Gene Sarazen—have accomplished it.