According to Lance Tingay of The Daily Telegraph and the Daily Mail, Graebner was ranked in the world top ten in 1964 and 1965, reaching a career high of World No.
4 in those rankings in 1964.
Graebner was included in the year-end top ten rankings issued by the United States Lawn Tennis Association from 1961 through 1965 and in 1967.
Author: Photograph with no copyright indication Source: Taken in Italy on 15 May 1966, first published on the Italian newspaper Stampa Sera on 16 May 1966 License: PD Italy (20 years after creation) PD-1996