List of Grand Slam men's singles champions
This article details the list of men's singles Grand Slam tournament tennis champions. Many changes have taken place in history which have affected the number of titles that have been won by various players. These have included the opening of the French national championships to international players in 1925, the elimination of the challenge round in 1922, and the admission of professional players in 1968 (the start of the Open era). All of these tournaments have been listed based on the modern definition of a tennis major, rather than when they  were officially recognized by the ILTF. The Grand Slam tournaments are the annual four major tennis events played in the Open era, which began in 1968, superseding the Amateur Era. The Australian and U.S. tournaments were officially recognized by the ILTF in 1924, and the French Championships followed a year later in 1925 when it became open to all international players. The United States Lawn Tennis Association (USLTA) had several grievances with the ILTF and refused to join when it was formed in 1913. From 1913 to 1923 there were three official championships recognized by the ILTF: During that same  time period the USLTA recognized the U.S. National Championships Champions list. "" Grand Slam achievements. Grand Slam. "Players who won all four Grand Slam titles in a calendar year." Non-calendar year Grand Slam. "Players who won all four Grand Slam titles consecutively (not in a calendar year)." Career Grand Slam. "Players who won all four Grand Slam titles over the course of their careers." Career Golden Slam. "Players who won all four Grand Slam titles and the Olympic gold medal over the course of their careers." Career Super Slam. "Players who won all four Grand Slam titles, the Olympic gold  medal and the Tour Finals in over the course of their careers." Grand Slam titles by decade. 1870s 1880s 1890s 1900s 1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s 2010s 2020s