Tony Stewart’s retirement season is off to a bumpy start.

After injuring his back in an ATV accident Sunday, the three-time NASCAR champion will miss the start of the Sprint Cup season, Stewart-Haas Racing announced Thursday. Stewart underwent surgery Wednesday to a burst fracture of his L1 vertebra.

In September, Stewart announced that this season would be his final year in the sport. He won championships in 2002, 2005 and 2011 but has not won a Sprint Cup race since 2013.

The Sprint Cup season begins with the Daytona 500 on Feb. 21, marking the first time in Stewart’s career — which began in 1999 — that he won’t compete in the race. The ATV injury means Stewart will retire having never won his sport’s most famous event.

Fellow NASCAR driver Greg Biffle was reportedly with Stewart when he suffered his accident.

Via USA Today:

Stewart-Haas Racing said Tuesday the driver/owner was hospitalized with an injury following an off-road vehicle incident. Biffle confirmed to Sirius he was in Stewart’s group, though he “wasn’t near what went on” and didn’t see exactly what happened.

“We were kind of all riding as a group,” Biffle told Sirius. “We started kind of hearing bits and pieces that he hurt his back. That’s all we knew. 

“I do know the people that helped him … (said) he was walking and moving all of his extremities, but he was in a lot of pain.”

For Stewart’s sake and NASCAR’s, hopefully he recovers fully and enjoys the back end of his retirement tour.

About Alex Putterman

Alex is a writer and editor for The Comeback and Awful Announcing. He has written for The Atlantic, VICE Sports, MLB.com, SI.com and more. He is a proud alum of Northwestern University and The Daily Northwestern. You can find him on Twitter @AlexPutterman.