Martin Truex Jr.'s race at Kansas Speedway when from good to bad in a matter of a pit stop.
After a round of green-flag pit stops with 51 laps to go, Truex Jr. was forced to come back down pit road for a tire problem -- going a lap down in the process.
"I couldn't believe," Truex Jr. told FOX Sports after the race. "Frustrating, but that's how it goes. We're going to win races for sure. We keep bringing cars like that, we're going to win some."
The No. 78 Furniture Row Racing driver dominated the race, leading 172 laps prior to the incident.
After further investigation, the team believed a lug nut was wedged in the hub of the wheel.