September 21, ➔ Find the Best Online Sports Betting Sites! ➔ Read reviews on legal online sportsbooks with our detailed guide on the best online. Football is widely considered to be the number one professional sport to wager sportsbooks, and NFL betting accounts for over 40% of their entire sports betting Online NFL betting sites grants bettors from across the globe access to NFL. Live odds and sports betting lines with point spreads and totals. Sports betting odds including NFL, NBA and NCAA college basketball, MLB and CFL. OddsShark Top Sportsbooks . in-depth reviews of the best online sportsbooks), charts detailing how NFL Over Unders have moved during the week, and improved sports.