@YoungTennisGuns
@WeAreTennis
Without a doubt Guillermo Vilas. Vilas was actually
#1
for over 20 weeks in 1975, 1976 and mostly 1977 when they did retrospective rankings
Others would be
Michael Chang, who came very close to becoming
#1
in late 1996, Stan Wawrinka, Goran Ivanišević and Juan Martín del Potro