Top ten ranked male tennis players (1912–1972)
This article presents top ten lists of male singles tennis players, as ranked by various official and non-official ranking authorities throughout the history of the sport. Rankings of U.S.-only professionals pre-Open Era, and U.S.-only amateurs during World War II are also included.
Source: Wikipedia — Top ten ranked male tennis players (1912–1972) (CC BY-SA 4.0)