The Grand Slam winners in tennis (Australian Open, French Open, Wimbledon and U.S. Open in the same calendar year):

Men
1938 -- Don Budge, United States
1962 -- Rod Laver, Australia
1969 -- Rod Laver, Australia

Women
1953 -- Maureen Connolly, United States
1970 -- Margaret Smith Court, Australia
1988 -- Steffi Graf, West Germany

In 1938, Budge defeated John Bromwich in the Australian final, Roderick Menzel in the French, Henry Austin at Wimbledon and Gene Mako in the U.S. Open to complete his Grand Slam.

In 1962, Laver defeated Roy Emerson in the Australian and French finals, Marty Mulligan at Wimbledon and Emerson again in the U.S. Open to complete his Grand Slam.

In 1969, Laver defeated Andres Gimeno in the Australian final, Ken Rosewall in the French, John Newcombe at Wimbledon and Tony Roche in the U.S. Open to complete his Grand Slam.

In 1953, Connolly defeated Julia Sampson in the Australian final and Doris Hart in the French, Wimbledon and U.S. Open finals to complete her Grand Slam.

In 1970, Smith defeated Kerry Melville in the Australian final, Helga Niessen in the French, Billie Jean King at Wimbledon and Rosie Casals at the U.S. Open to complete her Grand Slam.

In 1988, Steffi Graf defeated Chris Evert in the Australian final, Natalia Zvereva in the French, Martina Navratilova at Wimbledon and Gabriela Sabatini at the U.S. Open to complete her Grand Slam. Graf also defeated Gabriela Sabatini to win the gold medal at the 1988 Olympics in Seoul and complete the "golden" Slam.