The Tucson, Arizona, native emerged with the lead under the final 100 laps following a stellar service from his pit crew to tame his first Monster Mile victory.
The NASCAR Cup Series and the Xfinity Series travel to Dover International Speedway this weekend. The Camping World Truck Series has the week off but will return May 22 for the Toyota Tundra 225 at Circuit of The Americas.
The 18-year-old grandson of NASCAR Hall of Famer and team owner Joe Gibbs will return for an additional 14 Xfinity Series races throughout the 2021 season.
Brown continues to hold sole possession of the final spot to the 12-car Xfinity Playoff field by 31 points over Clements with five regular-season races remaining.
Four competitors remain in points-scoring position for the final three spots to the 2020 Cup Playoffs following a doubleheader weekend at the Monster Mile.