This championship has always been on a challenge basis – the champion retains the title until losing an official challenge, except in cases where the champion has retired. Originally, the champion had the right to accept or reject a challenge, usually depending upon the prize money put up by the challenger's sponsor: several years could thus go by between challenge matches. The top four ranked players in the world (excluding the champion himself) playoff for the right to challenge, with the champion and challenger playing a match of up to 13 sets over three days (4 sets, 4 sets and up to 5 sets on the final day). In theory, this is the only match the champion has to play in the two years since winning the last one. The most recent men's world championship match was held in
September 2025, with sets being played on 23 and 25 September (27 September, the scheduled third day, was unused) at the
International Tennis Hall of Fame in
Newport, Rhode Island World men's singles champions ==Men's doubles==