Samurai sword is the only thing worth taking into that cage.
Sure, in a tight fight, we'd be just as likely to hurt ourselves as the chimp, but the other weapons are too much of a one chance deal.
1.) Tazer - only get one real chance, and a pretty difficult one at that.
2.) Large rock (you pick the size and the weight) - again, one chance, and a rock large enough to do damage is hard to throw and easy to dodge. good luck bashing him with it close range.
3.) Baseball bat - probably the easiest to use, but I don't see it doing much. Also easy to grab and use against you.
4.) Brass knuckles and track spikes - ok, maybe easier than the bat, but still useless. seriously, are 1/2 needles going to put down the beast?
5.) Kitchen knife - maybe a good choice. you're going to get hurt before you can use this thing, but at least if you can gut the chimp while he's ripping your legs off, you might kill him before he can kill you
6.) Samurai sword - you're pretty likely to hurt yourself, but you know someone's going to get cut up with this thing. with some practice and a lot of luck, it'll be the chimp freaking out when you take his arm off, and then you can behead him. or if he moves in a way you don't expect, you accidentally take your own arm off instead and then the chimp kills you
7.) Spear - only one shot, and probably not that effective. it'll slow him down and make him mad, but not put him down.
8.) Bow and arrow - even worse than the spear. you're more likely to hit him, but what's it going to do? you'll only have time for one shot, maybe two if you're really good.
9.) Motorcycle - what are you going to do with this? try to run him over? you won't get any speed in a 100ft x 100ft cage. and he's still probably quick and agile enough to just jump on the thing while you try to run him down. if you try and use it to run from him by circling, he'll just watch you go round a few times before he pounces in and picks you off. you'll be circling pretty slow in that cage
10.) .22 cal gun with only one bullet - same as previous poster. you only get one shot, and it'd better go through his brain to make any difference
Come to think of it, are we being let out of opposite ends of this cage? With some good practice with the .22, and the hope that the chimp covers most of the distance toward you in a straight line (ie, not recognizing the gun and running/dodging), I'd say my best bet would be blow the brains out.
In an ideal world, I'd want to have the .22, the samurai sword, and a kitchen knife strapped to my leg for backup. I'd also want time to train and practice, and loads of time to view any footage of chimps fighting. And even then I'd probably get owned.
What do I get if I win? It'd have to be pretty big to get me to even think of this.