Premise: Real tennis -- one of several games sometimes called `` the sport of kings '' -- is the original racquet sport from which the modern game of lawn tennis ( usually simply called tennis ) is derived . Tennis is a racket sport that can be played individually against a single opponent ( singles ) or between two teams of two players each ( doubles ) . During most of the 19th century , in fact , the term `` tennis '' referred to real tennis , not lawn tennis : for example , in Disraeli 's novel Sybil ( 1845 ) , Lord Eugene De Vere announces that he will `` go down to Hampton Court and play tennis . '' Tennis is played by millions of recreational players and is also a popular worldwide spectator sport .
Hypothesis: Tennis is an activity.
Label: ENTAILMENT