It's Busch's seventh victory of the season and his 50th career victory to put him into a tie with Hall of Famers Junior Johnson and Ned Jarrett for 11th all-time.
Busch won both the Truck Series and Cup races over the weekend. Sunday's win was his sixth of the season. That ties him with Harvick for victories this season.
Three drivers have won 11 of this season's 14 NASCAR Monster Energy Cup races and on Sunday at Pocono Raceway Martin Truex, Jr. joined Kevin Harvick and Kyle Busch as multi-race winners.
An impressive night for Kyle Busch at Richmond Speedway who started 32nd and weaved his way to the front, then survived a series of late restarts and overtime to win his third straight race.
The completion of the Food City 500 at Bristol Motor Speedway will be completed on Monday after officials postponed the race after the third red flag of the day because of rain.
After four straight finishes of 2nd or 3rd, Kyle Busch finally came to the finish line as a winner on Sunday at the O'Reilly Auto Parts 500 at Texas Motor Speedway.