New Zealand's Scott Dixon has won the Firestone Indy 200 race in Tennessee for the third year in a row.
When it started raining Dixon was running second behind Tony Kanaan.
But while most drivers headed for the pits and a fuel stop when the yellow caution flag was first waved, Dixon and Wheldon both stayed on the track to take first and second spots.
Dixon said "it was a miscommunication on the pit call. That's the only reason that I didn't come in. I was angry for a few laps, but when I saw that rain coming down, I thought, 'Oh, this could work out pretty good.' ''
When the rain became heavier the red flag was waved, with Dixon and Wheldon still in front.
Helio Castroneves was third with Kanaan fourth.
Dixon now holds a 63 point lead over Castroneves in the driver's championship with Wheldon six points further back.