Began playing tennis soon after learning to walk when his father, Oscar, a tennis coach, introduced game to him...Named after former Argentine great Guillermo Vilas...Mother, Graciela, is a housewife...Comes from Venado Tuerto, a small town three hours from Buenos Aires and considers it �the best city in the world and I wouldn�t change it for any other�...Now has an apartment in Buenos Aires where he practices...He is oldest of three brothers, Federico, Roman...Admired Andre Agassi and Marcelo Rios while growing up...Captured Roland Garros junior title in 1999 (d. Nalbandian) and finished as No. 2 junior in world singles, No. 5 in doubles...Also won junior titles in Argentina, Paraguay and Canada...In doubles, won Wimbledon junior title (w/Nalbandian) and Orange Bowl 16s champion in 1997...Reached final of Orange Bowl 18s following year (l. to Federer)... Enjoys playing soccer with his friends, is a fan of River Plate team...Favorite band is Guns N� Roses...Considers clay as favorite surface but in 2004 reached finals on three different surfaces...Wife, Carla (married Dec. 27, 2003)...Opened GCoria Academy in Jockey Club de Venado Tuerto in 2004...Has a 5-3 career Davis Cup record in four ties.