The Pacers lead guard took a lead role in to start the GMR Grand Prix at IMS. Pacers guard Tyrese Haliburton had a big day a the Indianapolis Motor Speedway where he served as the Grand Marshall for the GMR Grand Prix Indy Car race on the road cars at the Brickyard. For Haliburton, that meant giving the ‘start your engines’ command for the drivers and then taking a couple of parade laps in the Indy Car two-seater driven by Indy legend Mario Andretti. Talk about diving head first into the local culture. As Haliburton was quoted in this Indy…