Betting mainly tennis, football, some volleyball here and there, and basketball. I have been watching tennis regularly from around 10 years now, and my bets are mostly based on the matches I have seen, backed up by regular newsstats data. As for football I have recently been trying stat-based analysis for underover betting, and we will see how this turns out, success rate have been promising so far. Good luck! You can argue, but when it comes to betting, in the end its always about luck. The best thing you can do, is help it with good analysis.