Guillermo Vilas
Guillermo Apolinario Vilas (born 17 August 1952, in Buenos Aires, Argentina) is a retired professional tennis player from Argentina. Although he peaked at World No. 2 on the ATP rankings in 1977, several sources and publications, as well as the current ATP ranking system, would rank Vilas as the real World No. 1 that year (often ranked equally with Björn Borg). Vilas was the second Latin-American to win a Grand Slam tournament.
Read more about Guillermo Vilas: Career, Distinctions, Doubles Titles (16), Singles Runner-ups (40)