What won the race: Second-starting Chad Mahder of Eau Claire, Wis., led all 40 laps of Friday's Rumble by the River 40 feature at Mississippi Thunder Speedway, earning his first career victory with the DiscountShopTowels.com Dirt Kings Tour and collecting $5,000.

Key notes: Jimmy Mars of Menomonie, Wis., finished in the runner-up position, 0.448 of a second behind Mahder. ... Series point leader Ron Berna of Shawano, Wis., finished ninth. ... A.J. Diemel of Navarino, Wis., started 18th and finished 10th. ... Dustin Sorensen of Rochester, Minn., challenged Mahder from the second spot but experienced engine trouble after completing 26 laps and finished 19th. ... After winning the first Dirt Kings Tour stop at Mississippi Thunder on July 9, Rodney Sanders of Happy, Texas, completed only 24 laps and finished 20th. ... Friday's feature, presented by Hurco Companies and Stone Machinery, was slowed by a single incident and lasted 16 minutes.

On the move: Nick Anvelink of Navarino, Wis., started 14th and finished third.

Winner's sponsors: Mahder’s No. 55c is sponsored by Underground Systems Incorporated Utility Contractors and Sabre Plumbing, Heating & Air Conditioning.

Points chase: Before Mississippi Thunder: 1. Ron Berna (315); 2. Brett Swedberg (297); 3. Nick Anvelink (291); 4. Justin Ritchie (273); 5. Kyle Raddant (249).

Current weather: Clear, 77°F

Car count: 25

Polesitter: Kyle Raddant

Heat race winners: Kyle Raddant, Jimmy Mars, Taylor Scheffler, James Giossi,  ,  ,  ,  

Next series race: August 27, Plymouth Dirt Track (Plymouth, WI) $1,250