With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Frank Sedgman was a tennis champion.
text_B: Francis `` Frank '' Arthur Sedgman , AM -LRB- born 29 October 1927 -RRB- is a retired former World No. 1 amateur tennis champion .. Order of Australia. World No. 1. World number 1 male tennis player rankings. tennis. tennis. 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 .. tennis. tennis. Jack Kramer. Jack Kramer. Sedgman , Kramer wrote , `` was as quick as anybody who ever played the game , but he could n't keep the heat on . ''. 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 .. tennis. tennis. multiple slam set. Grand Slam ( tennis )#Multiple Slam Sets. Margaret Court. Margaret Court. Roy Emerson. Roy Emerson. Martina Navratilova. Martina Navratilova. Serena Williams. Serena Williams. In 1951 he and Ken McGregor won the men 's doubles Grand Slam .. 1951 U.S. National Championships - Men's Singles. Ken McGregor. Ken McGregor. Sedgman turned professional in 1953 .. French Pro Championship#1953
related.