Key notes: The 19th annual CMH Diamond Nationals concludes with Saturday’s $25,000-to-win finale at Lucas Oil Speedway, a 60-lap feature for Lucas Oil Late Model Dirt Series competitors. … Ricky Thornton Jr. led all 40 laps to win Friday’s $15,000 opener at Wheatland, his first Lucas Oil victory since May 17. Thornton topped both $10,000 Show-Me 100 prelims last year before settling for fifth in the finale. … Points leader Jonathan Davenport led all 80 laps (shortened from 100) to win last year’s $50,000 Show-Me. … Hudson O’Neal swept April’s unsanctioned Spring Nationals event, earning more than $27,000. … Chris Simpson of Oxford, Iowa, won last year’s MLRA-sanctioned Fall Nationals, collecting $10,000. … Super stocks ($1,000-to-win) are on the undercard. … Gates open at 4 p.m. with hot laps at 6:30. … Watch live on FloRacing.

Who to watch: Ricky Thornton Jr. of Chandler, Ariz., eyes the weekend sweep after winning Friday’s $15,000 opener.

Points chase: Before Wheatland Saturday: 1. Jonathan Davenport (5,285); 2. Ricky Thornton Jr. (5,235); 3. Devin Moran (4,980); 4. Hudson O’Neal (4,945); 5. Garrett Alberson (4,770); 6. Brandon Sheppard (4,645); 7. Brandon Overton (4,565); 8. Daulton Wilson (4,305); 9. Carson Ferguson (4,115); 10. Donald McIntosh (3,960).

Expected entrants: Joining the top 10 in series points: Cade Dillard, Tony Jackson Jr., Payton Looney, Gordy Gundaker, Clay Stuckey, Jake O'Neil, Spencer Hughes, Justin Wells, Tyler Wolff, Aaron Marrant, Darron Fuqua, Daniel Hilsabeck, Trevor Gundaker, Dan Ebert, Clay Harris, Brennon Willard, Tyler Kuykendall, Kayden Clatt, Dalton Imhoff, Cory Lawler and more.

Next series race: July 15, Shelby County Speedway (Harlan, IA) $25,053