Andre Agassi quit tennis in 1994.
Andre Agassi . Agassi reached the World No. 1 ranking for the first time in 1995 but was troubled by personal issues during the mid-to-late 1990s and sank to World No. 141 in 1997 , prompting many to believe that his career was over . After suffering from sciatica caused by two bulging discs in his back , a spondylolisthesis ( vertebral displacement ) and a bone spur that interfered with the nerve , Agassi retired from professional tennis on September 3 , 2006 , after losing in the third round of the US Open to Benjamin Becker . The ATP Rankings are the Association of Tennis Professionals ' ( ATP ) merit-based method for determining the rankings in men 's tennis .