The Grand Slam in tennis is the achievement of winning all four major championships in one discipline in a calendar year. In doubles, a Grand Slam may be achieved as a team or as an individual with different partners. Winning all four major championships consecutively but not within the same calendar year is referred to as a "non-calendar-year Grand Slam", while winning the four majors at any point during the course of a career is known as a "Career Grand Slam".
Wheelchair tennis is one of the forms of tennis adapted for wheelchair users. The size of the court, net height and rackets are the same, but there are two major differences from pedestrian tennis: athletes use specially designed wheelchairs, and the ball may bounce up to two times, where the second bounce may also occur outside the court.
Esther Mary Vergeer is a Dutch former professional wheelchair tennis player. Vergeer won 43 major titles, 23 year-end championships, and seven Paralympic gold medals. She was the world No. 1 in women's wheelchair singles from 1999 to her retirement in February 2013. Vergeer went undefeated in singles for ten straight years, ending her career on a winning streak of 470 matches. She has often been named the most dominant player in professional sports.
Shingo Kunieda is a Japanese former wheelchair tennis player. With four Paralympic gold medals, 28 major singles titles – an all-time record in singles of any tennis discipline – and 50 major titles overall, Kunieda is widely considered the greatest male wheelchair player of all time.
Gordon James Reid is a British professional wheelchair tennis player. He was ranked world No. 1 in singles and world No. 1 in doubles. He holds two Paralympic gold medals, two silver medals, and one bronze medal, and is a two-time Grand Slam singles champion, and record holding twenty-six time Grand Slam doubles champion.
Alfie Hewett is a British professional wheelchair tennis player. He is the current world No. 1 in both singles and doubles.
Diede de Groot is a Dutch professional wheelchair tennis player who is the current world No. 1 in both singles and doubles.
Joachim Gérard is a Belgian wheelchair tennis player. He has been ranked world No. 1 in singles.
Ben Bartram (1/1)
Maximilian Taucher (1/1)
Charlie Cooper (1/1)
Ivar van Rijt (1/1)
Benjamin Wenzel (1/1)