He turned pro in 2001 and played his first competitive match at 15 yrs 10 months in 2002.
He turned pro in 2001. His first big match was against Roger Federer in Miami 2004 R32 where he prevailed in straight sets 6-3 6-3.
in 2001 when he was only 16 years old
He uses the new babolat aero pro drive strung with babolat RMP blasts.
He turned pro at age 16.
You don't need a tour card to turn pro. He simply earned his after he turned pro.