Andre Kirk Agassi (born April 29, 1970) is a former World No. 1 professional American tennis player who won eight Grand Slam singles tournaments and an Olympic gold medal in singles. He is one of only five male players to have won all four Grand Slam singles titles and the only male player to have won a career Golden Slam. He also is the only men's player in history to have won all four Grand Slam singles titles on three different surfaces. In addition to his Grand Slam and Olympic singles titles, he won the Tennis Masters Cup and was part of a winning Davis Cup team. He won 17 ATP Masters Series tournaments, more than any other player. TENNIS Magazine named him the 12th greatest player, male or female, for the period 1965 through 2005.

Because of sciatica caused by two bulging discs in his back, a spondylolisthesis (vertebral displacement) and a bone spur that interferes with the nerve, Agassi retired from professional tennis on September 3, 2006, after losing in the third round of the US Open. Agassi is married to Steffi Graf and has two children. 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.