 Even in the 1950s, some professionals continued to play tour matches.During his first five months as a professional (January through May 1957), Ken Rosewall played 76 matches on a tour against Pancho Gonzales but only 9 tournament matches.Joe McCauley determined that for 1952, only 7 professional tournaments were played by the top international players, and 2 other professional tournaments (the British Pro and the German Pro) were reserved for domestic players.