In early June 1949, Kramer won the Wembley Professional Championships in London, England, edging Segura in a close five-set semifinal, and defeating Riggs in the final. "Riggs set a fast pace in the first set, but he appeared to burn himself out in the early stages of the match". Kramer did not defend his U.S. Pro Championships title at Forest Hills N.Y., where Riggs defeated Budge in the final. However, Kramer won the Slazenger Pro at Scarborough, England in July 1949 beating Segura in the semifinal and Budge in the final. In early 1950, Kramer was described as "world champion in 1949". Kramer was not ranked by the USPLTA for 1949 due to insufficient play within the United States. Kramer did not play at Forest Hills or at the Philadelphia Indoor. Some recent tennis writers have considered Kramer to be World No. 1 for the 1949 period. 1950 In 1949–50, Kramer beat Pancho Gonzales 94 matches to 29 in the World Series. Kramer lost the final of the U.S. Pro Indoor at Philadelphia to Gonzales. At the U.S. Pro in June 1950 played at Cleveland on clay, Kramer lost a close five-set semifinal to Segura. Kramer was ranked U.S. No. 2 professional behind Segura for 1950 by the USPLTA. Some recent tennis writers have considered Kramer to be World No. 1 for the 1950 period. Kramer was described as "world professional champion" throughout 1950. 1951 In the 1950–51 World Series, Kramer beat Pancho Segura 64 matches to 28. Kramer won the Philadelphia U.S. Pro Indoor round robin event in March 1951, defeating Gonzales in the final. At the Philadelphia U.S. Pro Indoor, the service "drives" (not "forehand drives" as sometimes reported) of a number of players were electronically measured and compared to Tilden's reported service "drive" speed of 151 mph made by stopwatch and film in 1931. The service speeds were measured at the net, and not at the racquet face, as is currently the standard practice. Gonzales was recorded as hitting the fastest serve, 112.88 mph, followed by Kramer at 107.8, and Van Horn at 104. Kovacs, who possessed a big serve, played in the Philadelphia tournament but did not participate in the service speed measurements. Segura and Riggs participated in the test, but their results were not reported. Kramer did not play in the Cleveland International Pro (Cleveland U.S. Pro according to PTPA). At the USPLTA U.S. Pro