Gilles Müller (born May 9, 1983) is a Luxembourgish professional tennis player. He was a US Open junior champion and is the most successful male tennis player in the history of his country. He was born, raised and currently resides in Schifflange. – Wikipedia
His highest ranking is #59 (which he will probably surpass). He has career wins over Andy Roddick (2005 U. S. Open); Rafael Nadal (2005 Wimbledon); Andre Agassi (2004 Leggs Mason; Tommy Haas (2008 U. S. Open); Nikolay Davydenko (2008 U. S. Open to reach the quarter finals); Feliciano Lopez (2009 Australian Open first round – it was a 4 hour, 24 minute match – the score was 6-3, 7-6, 4-6, 4-6, 16-14) and Bernard Tomic (2009 Australian Open – 2nd round). His 10 singles and 3 doubles tournament wins are all in either Challenger events or Futures events
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His ATP Player Page – http://www.atpworldtour.com/Tennis/Players/Top-Players/Gilles-Muller.aspx
His record for the year (Yahoo Player Page) – http://sports.yahoo.com/tennis/players/540