johnvujohn
New User

I have always had a hard time breaking in the Nike Courtballistec 3.3s so I decided to buy another new pair of them and test this theory all Nadal fans have, that his single tongue shoe is more comfortable as opposed to the retail uni-tongue version.
I must note that this alteration does indeed feel more comfortable. The retail 3.3s have a uni-tongue similar to the 2.3s but instead has a thinner layer and is deeper inside the shoe as opposed to the 2.3's thick layer. However, the 3.3 is still too tight, in my opinion.
Thus, I cut the tongue even deeper (all the way to the second shoe lace hole) than what the factory has made but not completely. The 3.3's tongue itself is very thin compared to Nadal's custom shoes. To compensate, I cut a slit on the side of the tongue and took some cotton pillow filler to fill it in. The slit is unnoticeable since it's on the inside of the shoe.
Compare the opening of the before and after shoes. The single tongue one has a bigger open hole, allowing more room to fit your foot in.
I hope this helps.
Email me if you have any questions. Put "Nike Courtballistec" in the subject line so I know you're not a random person outside of this forum.
johnvujohn @ g m a i l dot com