All the pros customize their rackets. Lots of times I have read they raise their rackets swingweight a lot by adding lead tape. I have also read Nadal has a maximum spin setup on his racket ( with 15 g at 12 o clock at 5g in the handle). Why do so many pros customize their rackets and a lot of us dont? Could 5.5+ players that don't customize their racket be hurting their potential to become a pro by not customizing their racket? Does customizing a racket really help that much, i mean, if nearly ALL the pros do it, it must help , right? Are there any pros that dont customize their racket? Could one make it into the top pros today with a uncustomized racket?