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In 1980 the National Foundation of Wheelchair Tennis (NFWT) was founded to develop and sponsor competition in that sport. The rules for wheelchair tennis are the same as for regular tennis except that the ball is allowed to bounce twice before being returned. The first bounce must land inbounds, while the second bounce may land either inbounds or out-of-bounds.
If mobility is a problem, the court size can be reduced to accommodate the disabled person. This might be accomplished by having players without disabilities defending the entire regulation court while players with disabilities defend only half of their court. It could likewise be accomplished by permitting players to strike the ball on the second bounce.
The National Wheelchair Basketball Association has also modified the game for people confined to wheelchairs.