Busch, who wrecked his car during Cup practice early in the day, spun twice in Saturday’s Xfinity race but passed A.J. Allmendinger for the lead with four of 45 laps remaining.
His challengers changed over the final five laps, but he remained out front and claimed the win by 3.5 seconds over Daniel Hemric.
Busch is now a perfect 4-for-4 in Xfinity Series races this season and the victory was No. 101 for the series’ all-time wins leader.
“Obviously, tires. That was the saving grace for us,” said Busch, who was among a large group of drivers to pit on Lap 37 for new tires. “We had a set of tires left over and (Allmendinger) didn’t.
“When we did put our last set of tires on, I wasn’t sure we’d be able to get through that many cars. I don’t know what happened on those last couple of restarts. I couldn’t really see what was happening.
“We were fortunate to get by that stuff and get through that stuff without any damage to our race car.”
Michael Annett ended up third, A.J. Allmendinger was fourth and Harrison Burton rounded out the top-five.
Completing the top-10 were Kevin Harvick, Riley Herbst, Austin Cindric, Noah Gragson and Justin Haley.