Gustavo Kuerten, of Brazil, also known as the ''King of Clay

FRANCE - MAY 25: Gustavo Kuerten, of Brazil, also known as the ''King of Clay'' holds a commemorative slice of earth from where the clay for Roland Garros comes from, following his match with Paul-Henri Mathieu, of France at the French Open in Paris, France, on Sunday, May 25, 2008. Kuerten, known as ``Guga,'' won the event in 1997, 2000 and 2001 and is retiring after a series of hip injuries. The former top-ranked player, who won more than $14 million in his career, is making his first French Open appearance in three years. Mathieu won the match 6-3, 6-4, 6-2. (Photo by Suzanne Plunkett/Bloomberg via Getty Images)