when do you first see big 3 's first potential to multiple grand slam winner ?

[skypadq]

federer : i am first see federer reached 2001 RG QF
and im starting to belive this 19 year became grand slam champ
and i more assurance that federer beat pete sampras at 2001 wimbledon R16

nadal : 2005 clay season
he 's clay dominance is such a amazing
he won everything on clay almost everything

djokovic : 2007 IW / miami swing
novak djokovic reached final at 07 IW and won at miami
and my thought was how the 19 year old wins masters ?

 

[Mainad]

I saw their potential when they all won their maiden Slams but waited for them to confirm it by winning their 2nd.