Charles "Chuck" Robert McKinley, Jr.

Charles Robert "Chuck" McKinley, Jr. (January 5, 1941 – August 10, 1986) was an American former World No. 1 men's amateur tennis champion of the 1960s. He is remembered as an undersized, hard working dynamo, whose relentless effort and competitive spirit led American tennis to the top of the sport during a period heavily dominated by Australians.

McKinley won the 1963 Men's Singles Championship at Wimbledon, and as a result was ranked World No. 1 by some journalists. He paired with his college rival, Dennis Ralston, to win the 1963 Davis Cup, the only interruption in eight unbroken years of Australian dominance. He also paired with Ralston to win the U.S. Men's Doubles championships three times, in 1961, 1963, and 1964.

See more at https://en.wikipedia.org/wiki/Chuck_McKinley