The World Masters, known for sponsorship reasons as the Mita/Sky World Masters, was a snooker tournament held between 13 and 26 January 1991. Conceived by promoter Barry Hearn, the tournament had a similar format to the Grand Slam events in tennis, with men's singles, men's doubles, women's singles, women's doubles, mixed doubles and a junior competition. As in tennis, players had to win a match by two clear frames. If a match was tied going into a final frame, an additional two frames would be played. If the players were still level, there would be a tie break deciding frame with just one red and all the colours.