What won the race: Retaking the lead from Shane DeMey for good on lap 21, polesitter Cory Dumpert of Newman Grove, Neb., led the last 10 laps of Sunday's Repairable Vehicles.com Tri-State Series stop at Mason City Motor Speedway for a $3,000 payday on the Repairable Vehicles.com Tri-State Series. Dumpert led all but one lap in beating DeMey by 0.397 of a second for his first win of the season and second career Tri-State Series triumph.

Key notes: Dumpert earned his first victory since Sept. 27, 2025, in Tri-State Series action at Park Jefferson (S.D.) Speedway. ... Fourth-starting Shane DeMey slipped as low as fifth in the early going before briefly leading the 20th circuit and ceding control back to Dumpert then ultimately settling for the runner-up spot. ... Tim Ward challenged DeMey for much of the race before finishing third. ... Series points leader Trevor Anderson gained two spots and finished fourth. ... C.J. Horn, fresh off a Malvern East-West doubleheader in Nebraska, improved five positions and placed sixth. ... The race was slowed by five cautions, the first on lap 12 eliminatee Harrison Horn, Alex Smith and Ricky Jo Smith. ... Wayne Becker and Dalton Magers retired under the lap-13 slowdown. ... The 30-lapper lasted 24 minutes with 12 starters completing the distance and 13 running at the finish.

On the move: Dylan Fitzpatrick of Estherville, Iowa, started 16th and finished ninth.

Points chase: Before Mason City: 1. Trevor Anderson (1,365); 2. Cody Thompson (1,331); 3. Cory Dumpert (1,323); 4. Shane DeMey (1,240); 5. Chris Palsrok (1,130).

Current weather: Few Clouds, 81°F

Car count: 23

Polesitter: Cory Dumpert

Heat race winners: Cory Dumpert, Dyllan Ricks, Shane DeMey

Next series race: August 21, Rapid Speedway (Rock Rapids, IA) $1,500