Gibson undergoes surgery to remove kidney stone

Tony Gibson

Two weeks ago, Tony Gibson, the crew chief to Stewart-Haas Racing's Kurt Busch, thought he had successfully passed his second kidney stone in 33 days, an ailment that kept him from working the #41's pit box during the rain-delayed race at Bristol Motor Speedway.

Not so fast. Upon further review, the stone hadn't been passed. Three days after he successfully directed Busch to his first win of 2015 at Richmond, Gibson tweeted Wednesday he was undergoing "little surgery" to have the stones officially removed. NBC Sports