Tony Stewart suffered a broken right tibia and fibula in a sprint car crash Monday night at Southern Iowa Speedway in Oskaloosa, Iowa.
Stewart was leading the 30-lap ASCS Front Row Challenge feature when a lapped car spun in front of him. Stewart hit the lapped car and flipped, witnesses told FOX Sports.
Stewart was transported to a local hospital immediately following the accident and underwent surgery, according to a statement released by Stewart-Haas Racing.
The three-time NASCAR Sprint Cup champion will miss this weekend's Sprint Cup race at Watkins Glen International. A replacement driver has not been announced.
Stewart currently sits 11th in the Sprint Cup standings with one victory, putting him on the bubble for the Chase.
Just last week, Stewart flipped his sprint car multiple times at Ohsweken Speedway in Ontario, Canada. He was OK and would later call the incident an "average sprint car wreck."