Pro Championships

In addition to head-to-head events there were several annual professional tournaments that were called championship tournaments. The most prestigious was the Wembley Professional Championship at Wembley in England, played between 1934 and 1990, that was unofficially considered the world's championship through 1967. The oldest was the United States Professional Championship, played between 1927 and 1999. Between 1955 and 1962, it was played indoors in Cleveland and was called the World Professional Championships. The third major tournament was the French Professional Championship, played between 1930 and 1968. The British and American championships continued into the Open era but devolved to the status of minor tournaments.These three tournaments until 1967 are referred as the professional Grand Slam tournaments by tennis historians such as Robert Geist and Raymond Lee