Well, its just caught my attention but then the Tezuka Zone has actually never been deafeated and stuff. But then reading the manga shed to light one of the possibilities that could (and might actually WILL) defeat the Tezuka Zone. Basically, we all know that after Fuji's triple counters were beaten in the unofficial Tachibana match, he went and invented a fourth counter, known as the Kagerou Zetsumi or "Dragonfly Illusion". In my opinion, this is the key to the defeat of the Tezuka Zone. lets look at the facts:
An unorthodox technique where Tezuka seemingly controls the spin of the ball. Once hit towards the opponent, the topspin or the slice made will result in a ball that will curve in towards Tezuka's hitting range, all but without Tezuka moving. An elite techinique as once said in the manga.
The Dragonfly Illusion is a fourth counter made by Fuji Shuusuke and was one that was used in their match with Higa (I think). The principle of this technique is to nullify the spin of the ball and converting it into a sinker ball. A sinker ball is a ball which has no spin. But then it is hit in a special way by Fuji that it seemingly is a slow and floating ball but then in reality it is a fast ball.
Since the Tezuka Zone utilizes the spin that the opponent places into the ball, then it blatantly means that it is defeated by the Kagerou Zetsumi. Because the spin is nullified, it means that the ball won't curve in towards Tezuka and he's have to exert more effort in getting the ball. Thus Fuji has a chance to defeat Tezuka (aside from his Ultimate Trump Card, the Zero Shiki)
So is the hypotheses agreeable? Please post your comments and your insight regarding this.