Premise: The Australian Open is a major tennis tournament held annually over the last fortnight of January in Melbourne , Australia . The Grand Slam tournaments , also called majors , are the four most-important annual tennis events . Roger Federer ( born 8 August 1981 ) is a Swiss professional tennis player . Many players and analysts have called him the greatest male tennis player of all time . Stanislas `` Stan '' Wawrinka ( [ stanislas vavʁiŋka ] ; born 28 March 1985 ) is a Swiss professional tennis player .
Hypothesis: Roger Federer is a player of the sport tennis.
Label: ENTAILMENT