This is an interesting commercial - I never really got it until recently (or at least think I got it until recently). The cavemen in these commercials are actually all relatively intelligent, but Geico constantly talks about them as being stupid - and so its in Geico's best interest (in the fictional world of these commercials) for them to actually come across as stupid. So I think this commercial is actually presenting the caveman as winning, but Geico is "fixing" the match so that he's losing really badly - this is why he quits when he realizes it's a Geico-sponsored event and they're cheating to make him look like he's losing. The only thing that doesn't make sense is why the caveman didn't realize at first that it was a Geico-sponsored event since their signs are all over. Maybe he was just so into the match (and the fact that he was beating Billie Jean King). Still - it's a funny commercial.
