Tennis is not a sport.
Tennis . The sport can be played by anyone who can hold a racket , including wheelchair users . It had close connections both to various field ( `` lawn '' ) games such as croquet and bowls as well as to the older racket sport of real tennis . The four Grand Slam tournaments ( also referred to as the `` Majors '' ) are especially popular : the Australian Open played on hard courts , the French Open played on red clay courts , Wimbledon played on grass courts , and the US Open played also on hard courts .