Massachusetts. In both 1951 and 1954 there are two U.S. Pro tournaments listed here for each year. French Pro Championship The French Pro Championship was first held in 1930, held by the "Association Française des Professeurs de Tennis (AFPT)", entitled "Championnat International de France Professionnel" (French Pro Championships) on June 18–22, 1930. From 1930 the French Pro Championship was always played at Paris, on outdoor clay at Roland Garros except from 1963 to 1967 where it was held at Stade Pierre de Coubertin on indoor wood. Wembley Championship The Wembley Championship, also known as the Wembley Pro, was held at the Wembley Arena, in London. This professional event ran from 1934 to 1967 and was originally played on a wood surface placed over the top of a drained pool. It was officially known as the "London Indoor Professional Championships" from 1951 through 1967. List of professional major champions Singles Doubles Source: Other important tournaments The Championships at Wimbledon, the U.S. Championships, the French Championships, and the Australian Championships were typically the top events, where amateur players could compete for the title, albeit without prize money. Since the professional circuit was less organized and somewhat less popular than the amateur circuit, the professional events hierarchy changed each year. In 1934 the U.S. Pro was a high-class tournament with all top ranked pro players whereas in 1936 it was a meeting between pro teachers without any leading pro players. A tournament could even be canceled at any time due to poor attendance. Consequently, for a given year a pro tournament was important when it attracted the best pro players and then another year this same tournament could be a second-rank tournament because few or no leading players came. Before the open era in addition to numerous small tournaments and head-to-head tours between the leading professionals, there were some major tournaments which stood out at different periods. Some survived sporadically because of financial collapses while others temporarily rose to the highest levels of competition when other tournaments weren't held. These include: Bristol Cup: 1920–1932 Sometimes labelled "Professional Championships of France" this tournament was held on the French Riviera at Menton, at Cannes. Professional Championship of the World: 1927–1928 This event was held in October on clay courts, at the Queen's Club in London. In 1928 Myers of the Daily Telegraph wrote that "this was the best pro tournament ever held in England." List