Money is pouring into U.S. sportsbooks on these matches -- hundreds of thousands of dollars in betting handle daily -- yet the matches are shrouded in such secrecy, their legitimacy is in question. And in at least one state, sportsbook operators have filed incomplete or incorrect visit their website information with regulators as they sought permission to allow bets on the action. Usually, you can open a betting account by creating a username and password to access a betting site, and thus you are left with the impression that it is a gambling site with no verification required. While some bookmakers like Bet365 request verification upon your first deposit, most gambling services will not need proof until you try to withdraw funds for the first time. We use our expertise and years of betting experience to recommend the very best sports betting sites specifically for each sport! NFL is the king of sports and sports betting in the US from August to February. NBA and NHL bring regular-season action from October to April and playoffs action in May and June. MLB teams play a whopping 160 regular-season games between April and September. UFC offers smaller weekly events and huge fight cards roughly once a month. These are the best betting sites for each sport.