INDIANAPOLIS (Reuters) - Rookie Alexander Rossi rolled the dice on fuel and hit the jackpot winning the 100th running of the Indianapolis 500 on Sunday, as IndyCar racing ushered in a new era with an American winner.

Rossi, who moved to IndyCar only this year after losing his seat with Formula One tailenders Manor Racing, found himself on top of the motorsports world after squeezing just enough fuel out of his Andretti Autosport Honda to win what is billed as the 'Greatest Spectacle in Racing'.