Premise: Tennis is a racket sport that can be played individually against a single opponent ( singles ) or between two teams of two players each ( doubles ) . Tennis is an Olympic sport and is played at all levels of society and at all ages . The sport can be played by anyone who can hold a racket , including wheelchair users . 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 .
Hypothesis: Tennis is not a sport.
Label: CONTRADICTION