Ryan Hunter-Reay celebrates winning the 98th running of the Indianapolis 500 IndyCar auto race at the Indianapolis Motor Speedway in Indianapolis, Sunday, May 25, 2014. (AP Photo/AJ Mast)
Pole-sitter Scott Dixon, right front, of New Zealand, leads the field to the green flag for the start of the 92nd running of the Indianapolis 500 in Indianapolis on May 25, 2008. (AP Photo/Nam Y. Huh)
Helio Castroneves, of Brazil, kisses the bricks at the start-finish line after winning the Indianapolis 500 auto race in Indianapolis on May 24, 2009. (AP Photo/Mark Humphrey)
IndyCar driver Dan Wheldon poses with his family at the Indianapolis 500 in Indianapolis on May 30, 2011. Wheldon died Oct. 16, 2011 in a fiery 15-car wreck in Las Vegas. (AP Photo/Michael Conroy, File)
IndyCar driver Dan Wheldon, of England, douses himself with milk after winning the Indianapolis 500 auto race in Indianapolis on May 29, 2011. (AP Photo/Jeff Roberson)
Jim Nabors waves before singing "Back Home Again in Indiana" at the Indianapolis 500 auto race in Indianapolis on May 29, 2011. This will be the last year he will perform. (AP Photo/Jeff Roberson)
IndyCar driver Danica Patrick makes a pit stop during the Indianapolis 500 auto race in Indianapolis on May 29, 2011. (AP Photo/Jeff Roberson)
Dario Franchitti, of Scotland, and his wife, actress Ashley Judd, celebrate in victory circle after winning IndyCar's Indianapolis 500 auto race in Indianapolis on May 27, 2012. (AP Photo/Darron Cummings)
Dario Franchitti, of Scotland, kisses the start/finish line after winning IndyCar's Indianapolis 500 auto race in Indianapolis on May 27, 2012. (AP Photo/Tom Strattman)
Tony Kanaan, of Brazil, celebrates with winners milk after winning the Indianapolis 500 auto race in Indianapolis on May 26, 2013. (AP Photo/Michael Conroy, File)
The car driven by John Andretti crosses the start/finish line during practice on the third day of qualifications for the Indianapolis 500 auto race in Indianapolis on May 16, 2009. (AP Photo/Darron Cummings)
A look back at previous Indianapolis 500 races at the Indianapolis Motor Speedway. This is the 98th running of the race in Indianapolis, Ind.