Andre Agassi is an American former professional tennis player who won eight Grand Slam singles titles and an Olympic gold medal. He was one of the most dominant players in the sport during the 1990s and early 2000s, and is considered one of the greatest tennis players of all time. Agassi was the first male player to win all four Grand Slam tournaments on three different surfaces. He also won 17 ATP Masters Series titles and was part of a winning Davis Cup team.