Mayer, 17, scores upset Truck Series win at Bristol

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Sam Mayer celebrated his recent promotion to JR Motorsports by scoring his first NASCAR national series victory with a Truck Series win Thursday night at Bristol Motor Speedway.Sam Mayer celebrated his recent promotion to JR Motorsports by scoring his first NASCAR national series victory with a Truck Series win Thursday night at Bristol Motor Speedway.Read Morewww.espn.com – RPM