LAS VEGAS (CBS Sports.com) – IndyCar driver Dan Wheldon has been seriously injured in a massive 15-car wreck has sent cars flying through the air early in Sunday’s Las Vegas Indy 300. Paul Tracy, who was involved in the wreck, said a team of doctors were working on Wheldon, but there was no word of his injuries. A helicopter lifted off from the speedway, but there was no indication if Wheldon was onboard. Pippa Mann also appeared to be shaky as she was helped to an ambulance. The wreck coming out of Turn 2 on the 12th lap left Townsend...