Best 7 Online Sports Betting Sites 2020 — Top Sportsbooks Are you looking for the best sites for betting on sports and horse racing? Well, stick around, because this is all about showing you the best online betting sites. Here are the 3 Best Online Betting Sites / Sportsbooks Bovada Bovada has changed the face of Sports betting online. They have a great sportsbook, racebook and one of the largest online poker rooms for players in the US. Their racebook is only open to North American thoroughbred and harness races.