Premise: Francis `` Frank '' Arthur Sedgman , AM ( born 29 October 1927 ) is a retired former World No. 1 amateur tennis champion . In his 1979 autobiography Jack Kramer , the long-time tennis promoter and great player himself , included Sedgman in his list of the 21 greatest players of all time . Sedgman is one of only five tennis players all-time to win a multiple slam set in two disciplines , matching Margaret Court , Roy Emerson , Martina Navratilova and Serena Williams . The Grand Slam tournaments , also called majors , are the four most-important annual tennis events .
Hypothesis: Frank Sedgman played tennis.
Label: ENTAILMENT