The 2018 Alsco 300 was the 11th stock car race of the 2018 NASCAR Xfinity Series season and the 37th iteration of the event. The race was held on Saturday, May 26, 2018, in Concord, North Carolina at Charlotte Motor Speedway, a 1.5 miles (2.4 km) permanent quad-oval. The race was extended from 200 laps to 204 due to a NASCAR overtime finish. At race's end, Brad Keselowski of Team Penske would win the race under caution, as Tyler Reddick and Ty Majeski would both wreck on the backstretch on the final lap, putting out a caution. The win was Keselowski's 38th career NASCAR Xfinity Series win and his second of the season. To fill out the podium, Cole Custer of Stewart-Haas Racing with Biagi-DenBeste and Christopher Bell of Joe Gibbs Racing would finish second and third, respectively.