With twists on them, of course.

1) Lee vs. Kimimaro.

Use Lee BEFORE he was injured by Gaara, and instead of pulling a jug of sake from his belt, he grabs a bottle of the Hero Water from that god awful OAV and chugs it. Who wins?

2) Lee vs. Sasuke

Sasuke cannot use the curse seal. Lee cannot break any of the Gates. Pre injury Lee, but current Sasuke.

3) Neji vs. Gaara

The battle takes place in an arena made of stone - meaning Gaara can only use the sand he has on hand, so no Desert Avalanche.

4) Gai vs. Kakashi

No twists.

5) Kimimaro vs. Zabuza

Kimimaro can't use the curse seal.

6) Sasuke vs. Neji

Sasuke can't use the curse seal.

EDIT:

7) Kimimaro vs. Haku and Zabuza.

EDIT: No seal.