The 2013 Indianapolis 500 will go down as the most competitive race in Indianapolis Motor Speedway history.
Through 130 laps, there have been 45 lead changes among 13 drivers, breaking the last year's record of 34 changes. The 13 different drivers who have completed a lap in the lead also ties a record set in 1993.
With 50 laps remaining, the cars of Andretti Autosport have assumed control as E.J. Viso, Marco Andretti and Ryan Hunter-Reay hold the top three positions with green flag pit stops commencing.
AJ Allmendinger was leading just past halfway when he had to make an unscheduled pit stop for a seatbelt that had come undone and lost a lap to the field. He fell to 24th but cycled back into the top 10 as other drivers made pit stops.