What won the race: Regaining the lead from his daughter on the 26th lap, Scott Ward of Watertown, S.D., captured Sunday’s Marilyn Olson Memorialat his hometown Casino Speedway for his first Structural Buildings WISSOTA Challenge Series victory since 2017. Ward, who started on the front row alongside his pole-starting daughter Morgan, earned $2,071.

Key notes: Scott Ward took the checkers 0.435 seconds ahead of Jeffrey Massingill, who led laps 12-13. ... The Wards (Morgan, laps 1-3, 11, 14-25 and Scott, 4-10 and 26-40) led the rest of the way. ... Scott Ward has five career series victories; his previous WCS triumph came June 16, 2017, at Fiesta City Speedway in Montevideo, Minn. ... Casino, hosting the series for the 21st time, wrapped up the tour's four-race South Dakota stretch. ... Casino third-place finisher Chad Becker of Aberdeen, S.D., won Thursday ($3,000) and Saturday ($10,000) at Huron's Dakota State Fair Speedway.

On the move: Chad Becker of Aberdeen, S.D., started 10th and finished third.

Winner's sponsors: Ward’s Rocket Chassis is sponsored by Boldt Construction, Weelborg Crop Insurance, Line-X, Fleming Farms, Watertown Lawn and Garden/Small Engine Repair, Wehr's Machine, #1 Welding and Barrel House.

Points chase: After Casino: 1. Darrell Nelson (590); 2. Jeffrey Massingill (582); 3. Chad Becker (569); 4. Jake Redetzke (566); 5. John Kaanta (564); 6. Cole Searing (405); 7. Eric Mass (347); 8. David Carlson (324); 9. Curt Kranz (307); 10. Scott Ward (301).

Current weather: Clear, 79°F

Car count: 17

Polesitter: Morgan Ward

Heat race winners: Jeffrey Massingill, Scott Ward

Next series race: June 25, I-94 Sure Step Speedway (Fergus Falls, MN) $2,000