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Andre Kirk Agassi is an American former world No. 1 tennis player. He is an eight-time major champion, an Olympic gold medalist, and a runner-up in seven other majors. Agassi is the second of five men in the Open Era to achieve the Career Grand Slam. He is also the first man to complete both the Career Golden Slam and the Career Super Slam, achieving this feat in 1999. Agassi was the first man to win all four singles majors on three different surfaces, and remains the most recent American man to win the French Open and the Australian Open. He also won 17 Masters titles and was part of the winning Davis Cup teams in 1990, 1992 and 1995. 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 No. 141 in 1997, prompting many to believe that his career was over. Agassi returned to No. 1 in 1999 and enjoyed the most successful run of his career over the next four years. During his 20-plus year tour career, Agassi was known as "The Punisher". After suffering from sciatica caused by two bulging discs in his back, a spondylolisthesis and a bone spur that interfered with the nerve, Agassi retired from professional tennis after the 2006 US Open. He is the founder of the Andre Agassi Charitable Foundation, which has raised over $60 million for at-risk children in Southern Nevada. In 2001, the Foundation opened the Andre Agassi College Preparatory Academy in Las Vegas, a K–12 public charter school for at-risk children. He has been married to fellow tennis player Steffi Graf since 2001.