Definition: Grand Slam is a sports event in which an athlete reaches the semi-finals (or final) of four major professional Grand Slam tournaments, usually consisting of a men's or women's singles competition, a mixed doubles tournament, and a mixed team tournament. The name 'Grand Slam' originated from the belief that winning these events would secure the title of Grand Slam player, which was considered the highest level of achievement in sports. The four major professional Grand Slam tournaments are: 1. The men's singles, which is played on Sundays and lasts for two weeks. 2. The women's singles, which is played on Tuesdays and lasts for three weeks. 3. The mixed doubles, which is played on Saturdays and lasts for four weeks. 4. The mixed team, which is played on Wednesdays and lasts for five days. The Grand Slam event in tennis involves a high level of competition and athleticism, with players competing against each other to win the prize money and title of "Grand Slam champion." Each grand slam winner receives a large sum of money, as well as recognition from their respective sport and society.