Wheelchair tennis is one of the forms of tennis adapted for those who have disabilities in their lower bodies. The size of courts, balls, and rackets are same, but there are two major differences from pedestrian tennis; they use specially designed wheelchairs and the ball may bounce up to two times. The second bounce may also occur outside of the field.
This is one of the official Paralympic sports and also played at Grand Slams. There are three categories; Men, Ladies, and Quads and each category has singles and doubles tournaments. Quads is the category for those with quadriplegia and it is sometimes called Mixed especially at Paralympic Games. Quads players can hold rackets taped to the hand and use electric-powered wheelchairs.
Wheelchair tennis increased in popularity in 1977 due to the efforts of Brad Parks, who is seen as the creator of competitive wheelchair tennis. Since then, much effort has made to promote the sport to rid it of its 'therapy' image that still affects many sports for people with disabilities.
The sport quickly became popular worldwide and was introduced to the Paralympic Games as a demonstration event at the Seoul 1988 Summer Paralympics. It was at the 1992 Summer Paralympics in Barcelona that wheelchair tennis acquired the status of a full-fledged competition. The 2000 Summer Paralympics in Sydney boosted public awareness immensely and led to the introduction of the sport to Grand Slams of pedestrian tennis.
For the 2013 season the ITF decided to adopt match tiebreakers in place of a third and deciding set in doubles matches. However the tiebreaker would only be used at events which were rated as ITF1 or lower and at the World Team Cup. The grand slams however were free to decide on the format of their tournaments.
Major tournaments 
International tournaments are organized by International Tennis Federation as a NEC Wheelchair Tennis Tour. In wheelchair tennis there are four top-ranked major tournaments called Super Series (SS); Australian Open (Melbourne), British Open (Nottingham), Japan Open (Iizuka), and US Open (St. Louis). World Team Cup is an international team event held annually. To wrap up the season, they have NEC Wheelchair Tennis Masters (singles event) and Camozzi Doubles Masters tournaments which only world top-ranked players can compete. In addition, Grand Slams, Australian Open, Wimbledon, Roland Garros, and US Open have each created wheelchair tennis category. It is also played at Paralympic Games and FESPIC games as well.
Each year Wheelchair Tennis Masters are held for single and double. The top eight men and women based on the ranking after the US Open at the end of the year compete to be the champion of the year.
The Netherlands has dominated numerous victories at major tournaments including Paralympic Games and Grand Slams. It has many top players of this sport such as Robin Ammerlaan, Esther Vergeer, and Korie Homan.
In 1990 wheelchair tennis was played at the abled bodied event in Miami, this lasted for more than 15 years. The Wheelchair Tennis Class 8s at the 2002 Australian Open saw competitive wheelchair tennis take place at the same time and the same venue at a Grand Slam for the first time. In 2005 the Masters series was created, comprising all the events at the Grand Slams and the end of year championships, as Wimbledon and the US Open joined Melbourne. In 2007 Roland Garros joined and the Classic 8s were replaced by the Australian Open which had been held at the same venue two weeks later. In 2009 all events played at the abled bodied Grand Slams were renamed Grand Slams.
See also 
- International Tennis Federation. "Rules of Wheelchair Tennis". Retrieved 2012-07-08.
- International Tennis Federation. "About Wheelchair Tennis". Retrieved 2012-07-08.
- International Paralympic Committee. "'88 Seoul Paralympics: General Information". Retrieved 2011-07-12.
- International Tennis Federation: Wheelchair Tennis
- NEC Wheelchair Tennis Masters
- United States Tennis Association: Wheelchair Tennis
- Tennis Foundation (Great Britain): Wheelchair Tennis
- BBC Gloucestershire feature on the 2007 National Wheelchair Tennis Championships in Gloucester.
- Wheelchair Tennis from accessibility.com.au