I feel like you already know the answer. It seems you feel uneasy about it. That's the answer.
I'd say it breaks the spirit of the 8 precepts. For starters, you're not allowed to dance, I'd say sports are similar enough to that. As well going to see entertainments, so why would you be able to be a part of an entertainment? It's not in the right attitude of monkhood, a monk can't play sports. It's also a lot of running around and exercising, things monks don't do. There's also a sexual component to sports which is the main problem. You're sexual drive will go down a lot as a monk and you won't even be interested in things like sports at all. It just won't make any sense anymore. If you're preparing for monkhood then I'd think you should avoid doing things that monk aren't allowed to do as much as possible. You can't play basketball as a monk so better to drop the attachment now, otherwise it will just be harder adjusting. The Buddha didn't say you can't play video games as 8 precepts but do you think it's allowed? Sila isn't just about the stated rules, those are more like a guideline to put you in general state of mind. Think serene and dignified, that's the spirit of the 8 precepts.