You only win a bet mate, and that's great, but you are far away than beat the casino. To say that you beat the casino you must with the max pay out multiple times and the be able to withdrawal.

To beat a casino you need to make the casino lose big, those $300 not even represent the 1% of the bankroll, so, your win didn't hurt them at all, but again, it was a nice win and for sure you are happy as hell for it.

And the bet you win wasn't even with the casino games, so, you only got lucky on a sports match, but remember, luck comes and luck goes, let's hope your good streak stay for your next bets.