Key notes: Tazewell Speedway hosts the sixth round for the fledgling Southern Thunder Super Dirt Series in Friday’s 50-lap, $7,500-to-win seventh annual Melvin Corum Memorial. … The first-year series has only competed once since April 20 amidst multiple rainouts and rescheduled events. … Joseph Joiner of Milton, Fla., leads all drivers with two series wins thus far. … Ricky Weiss of Headingley, Manitoba, won last year’s Melvin Corum Memorial in Crate Racin’ 604 Series action. Weiss recently announced he is working with his immigration lawyer to return to the United States after he left to Canada following the passing of his grandfather. … Tyler Erb of New Waverly, Texas, won April’s $21,000 Lil’ Bill Corum Memorial, but he has been competing on the DIRTcar Summer Nationals. … Sportsman, street stocks and classics are on the undercard. … Pits open at 3 p.m. and grandstands open at 5, with hot laps at 7:30.

Who to watch: Points leader Zack Mitchell of Enoree, S.C., eyes his first career Southern Thunder Series victory.

Points chase: Before Tazewell: 1. Zack Mitchell (340); 2. Beckham Malone (294); 3. Dalton Cook (266); 4. Michael Brown (264); 5. Trey Mills (240)

Expected entrants: Zack Mitchell, Cory Hedgecock, Joseph Joiner, Dalton Cook, Casey Roberts, Michael Brown, Dylan Thornton, Benji Hicks, Beckham Malone, Austin Neely, Brent Robinson and others.

Next series race: July 12, Needmore Speedway (Norman Park, GA) $5,000