Grammy-nominated Jordin Sparks will sing the national anthem at next week's Indianapolis 500, race organizers announced Thursday. The singer, songwriter and actress also performed the anthem before the 2015 and 2024 races. This year's “Greatest Spectacle in Racing” is scheduled for May 24. “Jordin knows how important the national anthem performance is to the pre-race ceremonies of the Indianapolis 500, and we have been moved by her two previous renditions,” Indianapolis Motor Speedway President Doug Boles said in a statement released by track officials. "This year’s performance will be a special moment as we mark the 250th birthday of our nation and prepare for another incredible edition of the world’s greatest race.” Boles announced Wednesday that reserved seats for the race have been sold out, though there are still general admission tickets available.…