The 2018 OneMain Financial 200 was the 10th stock car race of the 2018 NASCAR Xfinity Series season and the 37th iteration of the event. The race was held on Saturday, May 5, 2018, in Dover, Delaware at Dover International Speedway, a 1 mile (1.6 km) oval-shaped permanent racetrack. The race took the scheduled 200 laps to complete. At race's end, Justin Allgaier of JR Motorsports would hold off his teammate Elliott Sadler in the closing laps to win his sixth career NASCAR Xfinity Series win and his first of the season. Allgaier would also win an extra $100,000 for winning a Dash 4 Cash event. To fill out the podium, Daniel Hemric of Richard Childress Racing would finish third.