Kabuto does.

This leaves twenty-six genin, so there will be thirteen matches. The first one up is Shino, facing one of the Grass genin.

He pays close attention.

As does Sugira.

Shino wins relatively easily, using his insects both as a distraction and a way to limit his opponent's ninjutsu.

Next up are Naruto and Kiba.

He grins at Kiba and bounces down to the arena. This hopefully shouldn't be too hard, he has a good sense of what the other rookies can do...

"Don't feel too bad when we beat you. It's nothing personal, right, Akamaru?" Akamaru yips in acknowledgement from his place inside Kiba's jacket.

"Same to you, dog breath."

"I'll show you the power of dog breath!" Kiba drops down onto all fours, becoming more feral in appearance, with lengthened canines and claw-like nails. He dashes at Naruto.

Naruto side-steps his attack, aiming to kick him in the ribs. (He'll start using his kukri if Kiba turns out to be a hard fight but he'd rather hold off on stabbing an ally.)

Kiba does not seem like he was expecting Naruto to be fast enough to do that.

"Heh," he coughs. "Maybe this'll be fun after all."

Naruto doesn't seem to realize he was going fast!

"Maybe if you sped up a bit." Kiba's still going slower than Sasuke pre-boosts, and worlds slower than Chihiro.

"I'm just getting warmed up." Kiba charges again, but he doesn't hit this time, instead throwing a smoke bomb and changing course.

Naruto does not stay in one spot, and starts mentally treating this like when Sasuke's decided to start covering his movements with an illusion, or Chihiro or Sasuke have flat out gone invisible - the floor's even so it's not like Naruto needs to see that, and otherwise this's the same sort of thing...

Can he quickly locate Kiba through hearing? Dog boy doesn't seem too sneaky...

Not as quickly as Kiba can track him down through scent. He slams into Naruto's side.

He rolls with it, ignores the probable bruising on his ribs, gets himself behind Kiba. Wrestling time! Hopefully Naruto can get him into a choke hold...

Kiba's still half-feral, and stronger than Naruto without chakra. Close quarters with him is not a smart move.

He'll back off with a kick once that becomes clear, jumping high to clear the cloud and then drawing his kukri. Serious Naruto time!

We interrupt this Serious Naruto Time for a brief intermission of Flying Akamaru Time. And pointy little teeth.

Stabbing the puppy would be incredibly mean so Naruto spins a bit to kick him instead.

Assuming he guessed the radius of Kiba's smoke bomb right, he should land well clear of the smoke.

Naruto the Puppy Kicker, that's what they'll call him. Neither Kiba nor Akamaru emerge from the smoke immediately.

He'll back up from it, then - so there's a good distance and so he still has room to maneuver - throwing a spread of shuriken with a net of ninja wire between them as he goes.

Two Kibas explode out of the smoke, leaping high over the wire and splitting off to flank Naruto.

Fun!

No easy way for him to tell which is real, and he can't just spam clones at them - 

He throws a kunai at the one on his left, then moves towards that same one, his knives at the ready.

(He's running through plans. He can probably activate an explosive tag, his chakra's too unreliable for ninjutsu but not gone... He can fake out Kiba, possibly with more explosive tags...)

They're faster like this, and his target easily evades his attack. They both flip into a spinning attack, doubling their speed, and come barreling at Naruto from different angles.

Still not as fast as Sasuke.

Explosive tag time! Naruto gets rapidly clear of the explosion radius, dropping low since he threw high - hopefully it's not too obvious the kunai he throws have explosive tags wrapped around their handles -