By Steve Keating INDIANAPOLIS (Reuters) -Sweden’s Marcus Ericsson prevailed in a two-lap shootout to win a dramatic Indianapolis 500 on Sunday as the Brickyard reclaimed the mantle of the world’s biggest single day sporting event, living up to its billing as the ‘Greatest Spectacle in Racing”. On a day of twists and turns on the 2.5 mile oval, the biggest came just six laps from the end when Jimmie Johnson got down on the grass and spun up into the wall, bringing out a red flag and sending the cars onto the pit lane. When the debris was cleared, the drivers returned to the track and with over …