The maximum number of sets in a men's singles Grand Slam match is five sets. In most Grand Slam tournaments, including the Australian Open, French Open, Wimbledon, and US Open, men's singles matches are typically played as best-of-five sets. The player who wins three sets first is declared the winner of the match. However, in certain situations, such as the final set going into a tiebreaker, an exception may be made to determine the winner. This format allows for longer matches and increases the potential for comebacks and dramatic encounters.