Clark_Graebner--Rene_Lacoste

Clark Graebner (born November 4, 1943) is a retired American professional tennis player.
He was four times a world top ten ranked player each year from 1966 to 1969, reaching world No. 3 in 1967 and world No. 7 the following year. He was ranked eight times in the top ten U.S. players by the USTA, reaching U.S. No. 2 in 1968 behind Arthur Ashe, and U.S. No. 3 in 1966 and 1971.
Graebner won three U.S. national titles, the U.S. Clay Court in 1968, the U.S. Hard Court in 1969, and the U.S. Indoor in 1971. He was a member of the U.S. Davis Cup team which won the Davis Cup in five straight years from 1968 to 1972.
He won a Grand Slam doubles title at the 1966 French Championships at Roland Garros with doubles partner Dennis Ralston.