Key notes: Originally scheduled as a doubleheader before Friday’s opener rained out, Fiesta City Speedway hosts the Structural Buildings WISSOTA Challenge Series for Saturday’s $3,000-to-win main event. … The weekend concludes with another $3,000-to-win program at Casino Speedway in Watertown, S.D. … Shane Sabraski of Rice, Minn., won last year’s WISSOTA Challenge Series stop at Fiesta City, worth $3,000. … Tyler Peterson of Hickson, N.D., swept 2024’s doubleheader there, collecting more than $6,000. … Matt Gilbertson topped May 1’s season opener in local WISSOTA Late Model action at his home track in addition to a $3,500 payday he earned in the fall of 2023. … Jordan Tollakson of Montevideo, Minn., earned a $2,000 payday there in the fall of 2022 in local WISSOTA action. … Gen X Late Models, midwest modifieds and street stocks are on the undercard. … Pits open at 3 p.m. and grandstands open at 4 with racing at 6. … Watch live on Dirt Race Central.

Who to watch: Shane Sabraski of Rice, Minn., seeks his second straight WISSOTA Challenge Series victory at Fiesta City.

Points chase: Before Fiesta City: 1. Kevin Burdick (112); T2. Tyler Peterson (105); T2. Shane Sabraski (105); 4. Cole Searing (102); 5. Kevin Eder (101).

Expected entrants: Shane Sabraski, Tyler Peterson, Matt Gilbertson, Kevin Burdick, Dave Mass, Cory Crapser, Kevin Eder, Zach Johnson, Ryan Mikkelson, Gunner Frank, Jeff Provinzino, Johnny Broking, Joel Bennett, Devin Fouquette, James Trantina III, Todd Frank, Onyx Johnson, Taylor Madrinich, Ryan Schaufler, Cory Tammen, Scott Lehn and others.

Next series race: June 7, Casino Speedway (Watertown, SD) $3,000