A promising run for Scott Riggs in the final Southern 500 at Darlington ended abruptly when his seemingly fast #10 MBV Motorsport Valvoline Chevrolet changed course halfway through Sunday's 367-lap race, leaving him with a disappointing 25th place finish.

Despite having a fast car in Friday's morning practice session, Riggs was forced to start the demanding 500-mile event in 31st position after qualifying was rained out and the 43-car field was set by owners points.

But when the green flag waved over the 1.366-mile track nicknamed 'Too Tough to Tame', Riggs began making his way toward the front of the field, breaking into the top-10 at the halfway mark of the race.

"The car was getting better and better all day," said Riggs. "We were steadily moving through the field and got all the way to ninth place. And then we don't know what happened, the car just started getting real tight. We came in and threw huge adjustments at it, but nothing seemed to work.

"We've got to get the car back to the shop and figure out what went wrong. I don't know if we had a shock go bad or if we had a spring failing on us or what. Whatever it was, it definitely wasn't a lack of effort on anybody's part. This team never gave up today, even when we fell off the lead lap."

"We moved from 31st into the top-10 and then it took a turn for the worse," Riggs continued. "But to be able to drive from the back to the front at the "Track Too Tough Too Tame" is still a good effort. It's too bad we couldn't come away with the finish we deserved."