In tennis, set point occurs anytime a player or pair is one point away from winning a set. Set point refers to the name of the last point that could occur in a set, which could occur many times during a match. If a server is winning a set 5-3 and the score of the final game is 40-30, the next point would be referred to as the set point.
A set point could occur for either the player serving or the player returning the serve during that game, depending on the score of the match at that time.
When a player or pair is in the last game of a set before winning, the amount of points they are winning by determines the name of the set point that is being played.
If the set was still 5-3, but the server was winning 40-15 instead, the next point would be referred to as double set point because the server is winning by two points. If the server is winning 40-0, the next point would be referred to as triple set point because they are winning the game by three points.
When the set point would lead to the end of the match, it is referred to as the match point, double match point, or triple match point depending on the score of the final game in the match.
If the set point would lead to the winner of a tournament, the set point can be referred to as championship point. Similarly to match and set point, a player can have championship point, double championship point, and triple championship point.