Preakness Stakes betting is open today. Add exclusive Preakness promo codes and learn how to bet the Preakness with the best online horse betting sites, like TwinSpires, FanDuel Racing and 1/ST BET.

The list of Preakness betting promos across the country is short, but FanDuel leads them with a $500 no-sweat bet for new users.

Just three horses who ran in the Kentucky Derby will run in the Preakness on Saturday -- Journalism, who finished second to Sovereignty, American Promise (16th) and Sandman (seventh). Nine horses will enter the race, including several newcomers to the Triple Crown trail.