The third surgery on Tony Stewart's broken right leg was for an infection that "popped up" after the three-time NASCAR champion had begun walking a bit again.
Front Row Motorsports will bring back drivers David Gilliland and David Ragan in 2014.
Michael Waltrip Racing will run only two full-time cars next season because of the loss of sponsor NAPA, part of the fallout from its attempts to manipulate a race to get Martin Truex Jr. into the Chase.
Brian Vickers will miss the rest of the NASCAR season because of a blood clot in his right calf.
Kevin Harvick will run a minimum 12 Nationwide Series races next season for JR Motorsports.
A six-car NASCAR test at Charlotte Motor Speedway focused on the aerodynamic package for 1.5-mile tracks.
Brad Keselowski snapped a 37-race winless streak Saturday night by chasing down Kasey Kahne in the closing laps at Charlotte Motor Speedway.
Kyle Busch raced to his 11th Nationwide Series victory of the year Friday night, giving him a season sweep at Charlotte Motor Speedway.
The Southern 500 at Darlington Raceway will be run in April next year after nearly a decade of racing on Mother's Day weekend.