RICHMOND, Va. — Kyle Busch took the lead on pit road after just more than 50 laps and showed why he's the Xfinity series career victory leader with a dominant run Friday night at Richmond International Raceway.The defending Sprint Cup Series champion led 197 of 250 laps for his 84th victory in NASCAR's second-tier series. He also won for the eighth time in 14 starts this season.The Virginia529 College Savings 250 was slowed by caution flags just twice, which that let Busch build leads as much as 7 seconds. At one point, there were only five cars on the lead lap. His margin of victory was a whopping 6.453 seconds. Only 11 cars finished on the lead lap.Erik Jones, Busch's Joe Gibbs Racing teammate, finished second, followed by Brad Keselowski and points leader Elliott Sadler.Pole-sitter Austin Dillon led the first 51 laps, but Busch led virtually the rest of the way. Sprint Cup qualifying: Denny Hamlin earned the pole for tonight's race at Richmond, about 20 miles from where he grew up in Chesterfield. His lap of 122.344 mph around the 0.75-mile oval edged Kyle Larson (122.288).