They call the Indianapolis 500 ''The Greatest Spectacle in Racing'' for its high speeds, rich history, enormous crowd and the take-your-breath-away competition. This year, IndyCar is hoping the 99th running of the event won't be a spectacle because of a serious on-track incident. Concern hangs over Indianapolis Motor Speedway after the cars of Helio Castroneves, Josef Newgarden and Ed Carpenter all went airborne during practice sessions in the 10 days leading up to Sunday's race. More...