1986: Between 1980 and his retirement from the sport in 1993, Jahangir Khan dominated squash. The Pakistani player won approximately 825 professional matches and lost 29; he won the British Open 10 times and the World Open six times. His defeat in the final of the World Open in November 1986 was the first time he had lost a match for 5½ years.
Source: Rod Gilmour and Alan Thatcher, Jahangir Khan 555: The Untold Story behind Squash’s Invincible Champion and Sport’s Greatest Unbeaten Run (2016), chap. 9