MARTINSVILLE, Va. – William Byron knew he was in for a big challenge with a two-lap overtime sprint about to start and the very aggressive Joey Logano right behind him.

He also felt like he had a pretty remarkable co-pilot in his corner.

“This one is for my mom,” Byron said. “This same weekend last year she had kind of a mini-stroke and was diagnosed with brain cancer. It means a lot to have her here and it’s been a crazy year. But she’s doing great.”

Byron took the lead on pit road after Stage 2 stops and held it pretty much the rest of the way at Martinsville Speedway – he led 212 laps – to become the first repeat winner this season in NASCAR’s Cup Series on Saturday night.

Byron needed to hold off a challenge – and a nudge – from Logano on a two-lap overtime sprint to finish it, but won for the fourth time in his career and gave Hendrick Motorsports four victories in eight races this season.

When the final caution, and only the second for an on-track issue of the night, came with five laps to go, Byron and the seven drivers behind him opted to stay out for the final dash.

“I thought everyone behind us would pit, and luckily we stayed out,” he said. “We were aggressive; we felt like we could refire on the tires and be OK, and you’ve got one of the most aggressive guys behind you in Logano.”

Byron had both a fast car that allowed him to pull away on restarts and a strong one on long runs, critical since there wasn’t a caution for anything but the end of a stage until the 311th of 400 laps on the 0.526-mile oval.

That changed when Todd Gilliland had a flat tire and hit the wall with five laps to go.