sentences:  Challenge - This is a single-player mode, where a player using any character has to beat 4 randomly chosen characters on each of the 4 Grand Slam surfaces.Unlike 'exhibition' mode, the computer difficulty only ranges from beginner to pro, with no insane level.World Tour - The player chooses a character and has to play in a number of events around the world against computer controlled opponents, trying to reach the ranking of world number 1.