DOVER, Del.—Kyle Busch’s latest NASCAR victory came like so many of the first 18.

Pretty easily.

Busch made it eight victories this season in the Nationwide Series, leading 157 laps and absolutely dominating to win Saturday in a green-white-checkered flag finish at Dover International Speedway.

“It was a pretty flawless day for us,” Busch said. “We made it look easy.”

That was win No. 19 this season for Busch in the Nationwide, Trucks and Sprint Cup races. No one is having a season like Busch, even though his 34th-place finish in the Cup race las...

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