Who is the only male tennis player to have won the calendar year Grand Slam twice?

The correct answer is B, Rod Laver. The Australian won all four Majors in the same calendar year in 1962 as an amateur and did it again in 1969, in the second year of the Open Era, which no other man has matched. The main arena of the Australian Open in Melbourne is named the Rod Laver Arena in his honour.

Option A, Don Budge of the United States, was the first man ever to complete a calendar Grand Slam, in 1938, but he did it only once. Option C, Roger Federer, won twenty Major singles titles and held three of the four at once more than once, but never all four inside a single calendar year. Option D, Bjorn Borg, won the French Open and Wimbledon repeatedly but never played the Australian Open in his prime years and never won the US Open, so a calendar Slam was out of reach. Among women, Maureen Connolly in 1953, Margaret Court in 1970 and Steffi Graf in 1988 completed the feat once each.