The deal will see FanDuel, an official sports betting partner of the PGA Tour, become Spieth’s exclusive sports betting and fantasy provider.
In addition to becoming the face of FanDuel’s golf products, Spieth will appear in TV commercials and co-ordinate with FanDuel’s social media content.
Spieth said: “As the world of legal sports betting grows rapidly in the US, I’m incredibly excited about what’s happening in the space and the potential it has to bring new fans to the sport of golf.
“As the PGA Tour and others in the golf world have strongly embraced legalized sports gaming, I look forward to working with FanDuel to find unique ways to engage the fast-growing fanbase.”