 While the World Grass Court Championships (Wimbledon) and World Hard Court Championships (WHCC) could justify their "world championship" titles, the WCCC had trouble attracting top players from outside Europe.At an Annual General Meeting (AGM) held on 16 March 1923 in Paris, France the ILTF issued the ‘Rules of Tennis’ that were adopted with public effect on 1 January 1924.USA became an affiliated member of the ILTF.