External Reference
- History of the Pro Tennis Wars, by Ray Bowers
- Chapter I: Suzanne Lenglen and the First Pro Tour
- Chapter II, Part 1: The eminence of Karel Kozeluh and Vincent Richards 1927-1928
- Chapter II, Part 2: Deja vu 1929-1930
- Chapter III: Tilden's Year of Triumph in 1931
- Chapter IV: Tilden and Nusslein, 1932-1933
- Chapter V: The Early Ascendancy of Vines, 1934
- Chapter VI: Vines's Second Year: 1935
- Chapter VII: Awaiting Perry, 1936
- Chapter VIII: Perry and Vines, 1937
- Chapter IX: Readying for Budge, 1938
- Chapter X: Budge's Great Pro Year, 1939
- Chapter XI: America, 1940-1941
- Chapter XII: America, 1942
Read more about this topic: World-number-one Male Tennis-player Rankings
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