About fifteen. However, that’s just how many sports were offered at its launch. That number will likely change for a few reasons. Olympic sports are only every two years, so that category will come and go. TwinSpires Sportsbook may onboard more oddsmakers with expertise in new sports. As long as it’s approved by the Michigan Gaming Control Board, that sport could be offered by TwinSpires. But for now, it has a healthy sports selection to choose from.