Key notes: The Structural Buildings WISSOTA Challenge Series concludes its 2026 season with Wednesday’s 40-lap, $3,000-to-win finale at I-94 EMR Speedway. … Reigning champ Dave Mass of East Bethel, Minn., outdueled Cole Searing to win Tuesday’s first 40-lap feature at I-94, serving as an unofficial warmup for the 40th annual Speedway Motors WISSOTA 100. Mass notched his second Challenge Series win of the season and sixth overall I-94 triumph. … Wednesday’s action features an identical 40-lap program with the top-eight finishers clinching starting spots in Saturday’s 50-lap WISSOTA 100 feature. … Searing, of Huron, S.D., earned a $3,000 Challenge Series victory there in May 2024. … Lucas Oil Series regular Dan Ebert of Lake Shore, Minn., is rumored to join Wednesday’s racing action after the Knoxville Late Model Nationals rained out. Ebert earned 2020’s King of Dirt victory at I-94, worth $5,087. … Chad Becker of Aberdeen, S.D., won his third career WISSOTA 100 last fall (2017, ’19, ’25), combining for more than $30,000. … Points leader Kevin Burdick of Proctor, Minn., is a two-time tour winner at I-94, including May’s $3,000 opening series visit; Burdick enters Wednesday with a 19-point advantage over Mass. … Shane Sabraski of Rice, Minn., won 2024’s Challenge Series season finale at I-94 in addition to that year’s WISSOTA 100. … Tyler Peterson of Hickson, N.D., topped 2024’s NLRA-sanctioned King of Dirt after grabbing his first WISSOTA 100 there in 2023, collecting more than $12,000. … Pits open at 10 a.m. and grandstands open at 3 p.m. with hot laps and qualifying at 4:30. … Watch live on Dirt Race Central.

Who to watch: Dave Mass of East Bethel, Minn., seeks back-to-back Challenge Series wins at I-94 after topping Tuesday’s opener.

Points chase: Before I-94 Wednesday: 1. Kevin Burdick (761); 2. Dave Mass (742); 3. Shane Sabraski (741); 4. Johnny Broking (681); 5. Jeff Provinzino (663).

Expected entrants: Dave Mass, Cole Searing, Dan Ebert, Cody Overton, Kevin Burdick, Shane Sabraski, Tyler Peterson, Cole Schill, Sammy Mars, Ryan Mikkelson, Trevor Anderson, Josh Zimpel, Zach Johnson, Jeff Provinzino, Mike Stearns, Cory Crapser, Johnny Broking, Amelia Eisenschenk, Jordan Tollakson, Jayson Good, Nick Corbett, Laela Eisenschenk, Dexton Koch, Dalton Magers, Taylor Madrinich and more.