For his first-ever short-track win in the NASCAR Xfinity Series, Sam Mayer gets it done in a tire battle at Iowa Speedway. Today looked like it was going to be all about Joe Gibbs Racing, but the JR Motorsports driver had other ideas. Late in the race it was down to Riley Herbst and Sam Mayer on the front row. An overtime restart to finally decide the winner at Iowa Speedway. Herbst tried his best, but the No. 1 car was too good. After the finish, Herbst gave Mayer a flat to his left rear. A little drama between the two drivers for sure. Joe Gibbs Racing makes early statement Just like in the …