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| 5/7/2021 | Mississippi Thunder Speedway - Fountain City, WI Dairyland Showdown with World of Outlaws Late Models Dirt Super Late Models: World of Outlaws - Late Models A Modifieds, USRA Modifieds | Results | | A.J. Diemel (USRA Modifieds) | 3rd | - | - | 5th |
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| 5/8/2021 | Mississippi Thunder Speedway - Fountain City, WI Dairyland Showdown with World of Outlaws Late Models Dirt Super Late Models: World of Outlaws - Late Models A Modifieds, USRA Modifieds | Results | | A.J. Diemel (USRA Modifieds) | 1st | - | - | 3rd |
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| 5/22/2021 | Cedar Lake Speedway - New Richmond, WI CLS Dash #5 360 Sprints - Non-Winged: Traditional Sprint Car Series A Modifieds, Midwest Modifieds, Dirt Late Models, 305 Sprints - Non-Winged, Super Stocks, USRA Late Models | Results | | A.J. Diemel (Dirt Late Models) | 1st | - | - | 21st (DNF) |
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| 5/29/2021 | Rice Lake Speedway - Rice Lake, WI Swant Graber presents Structural Buildings WISSOTA Challenge Series (No Mods) plus PS, St S, SS, MWM WISSOTA Late Model: Wissota Late Model Challenge Series WISSOTA Midwest Mods, WISSOTA Pure Stock, WISSOTA Street Stock, WISSOTA Super Stock | Results | | A.J. Diemel (WISSOTA Late Model) | 6th | - | - | 22nd (DNF) |
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| 6/4/2021 | Mississippi Thunder Speedway - Fountain City, WI 13th Annual Rivercity Rumble Dirt Super Late Models: Lucas Oil MLRA USRA B-Mods, USRA Modifieds, USRA Late Models | Results | | A.J. Diemel (Dirt Super Late Models) | 2nd | - | - | 3rd | | A.J. Diemel (USRA Modifieds) | 2nd | - | - | 1st |
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| 6/11/2021 | Red Cedar Speedway - Menomonie, WI Race of Champions Raindate - Regular Night Hornets, WISSOTA Midwest Mods, WISSOTA Modifieds, WISSOTA Late Model, WISSOTA Street Stock, WISSOTA Super Stock | Results | | A.J. Diemel (WISSOTA Late Model) | 2nd | - | - | 1st |
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| 6/17/2021 | Cedar Lake Speedway - New Richmond, WI 22nd Annual Masters A Modifieds, Dirt Late Models, USRA Modifieds, USRA Late Models | Results | | A.J. Diemel (Dirt Late Models) | 1st | - | - | 4th | | A.J. Diemel (USRA Modifieds) | 2nd | - | - | 15th |
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| 6/18/2021 | Cedar Lake Speedway - New Richmond, WI 22nd Annual Masters A Modifieds: USMTS - United States Modified Touring Series Dirt Late Models, USRA Late Models, WISSOTA Modifieds | Results | | A.J. Diemel (A Modifieds) | 1st | - | - | 1st | | A.J. Diemel (Dirt Late Models) | 1st | - | - | 10th |
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| 6/19/2021 | Cedar Lake Speedway - New Richmond, WI 22nd Annual Masters Limited Sprints - Winged: Upper Midwest Sprint Car Series A Modifieds: USMTS - United States Modified Touring Series Dirt Late Models, USRA Late Models, WISSOTA Modifieds | Results | | A.J. Diemel (A Modifieds) | 4th | - | 15th | - | | A.J. Diemel (Dirt Late Models) | 1st | - | - | 5th |
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| 7/2/2021 | Red Cedar Speedway - Menomonie, WI Bob Zebro 4th of July Shootout Hornets, WISSOTA Midwest Mods, WISSOTA Modifieds, WISSOTA Late Model, WISSOTA Street Stock, WISSOTA Super Stock | Results | | A.J. Diemel (WISSOTA Late Model) | 5th | - | - | 4th |
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| 7/9/2021 | Jackson Motorplex - Jackson, MN World of Outlaws Morton Buildings Late Model Series Dirt Super Late Models: World of Outlaws - Late Models Dirt Late Models: Tri-State Late Models | Results | | A.J. Diemel (Dirt Super Late Models) | 9th | - | - | 18th |
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| 7/10/2021 | Jackson Motorplex - Jackson, MN World of Outlaws Morton Buildings Late Model Series Dirt Super Late Models: World of Outlaws - Late Models Dirt Late Models: Tri-State Late Models | Results | | A.J. Diemel (Dirt Super Late Models) | 8th | - | - | 15th |
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| 7/18/2021 | Red Cedar Speedway - Menomonie, WI World of Outlaws Late Models & $1,000 to Win Open Modifieds w/ Limited Late Models Dirt Super Late Models: World of Outlaws - Late Models A Modifieds, Dirt Limited Late Models | Results | | A.J. Diemel (Dirt Super Late Models) | - | - | - | 7th | | A.J. Diemel (A Modifieds) | 1st | - | - | 1st |
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| 7/22/2021 | Red Cedar Speedway - Menomonie, WI Dunn County Fair Night #1 & Street Drags Dirt Super Late Models, Hornets, WISSOTA Late Model | Results | | A.J. Diemel (WISSOTA Late Model) | 1st | - | - | 1st |
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| 7/24/2021 | Cedar Lake Speedway - New Richmond, WI CLS Dash #11 / Late Model $5,000 To Win 360 Sprints - Non-Winged: Traditional Sprint Car Series A Modifieds, Midwest Modifieds, Dirt Late Models, 305 Sprints - Non-Winged, Super Stocks | Results | | A.J. Diemel (A Modifieds) | 2nd | - | - | 1st | | A.J. Diemel (Dirt Late Models) | 1st | - | - | 15th (DNF) |
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| 7/29/2021 | ABC Raceway - Ashland, WI 444 Memorial For Tanner Byholm WISSOTA Late Model: Wissota Late Model Challenge Series A Modifieds, WISSOTA Midwest Mods, WISSOTA Modifieds | Results | | A.J. Diemel (WISSOTA Modifieds) | 4th | - | - | 13th | | A.J. Diemel (WISSOTA Late Model) | 5th | - | - | 6th |
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| 8/5/2021 | Cedar Lake Speedway - New Richmond, WI 34th Annual USA Nationals Night 1 Dirt Super Late Models: World of Outlaws - Late Models USRA Late Models | Results | | A.J. Diemel (Dirt Super Late Models) | - | - | - | - |
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| 8/6/2021 | Cedar Lake Speedway - New Richmond, WI 34th Annual USA Nationals Night 2 Dirt Super Late Models: World of Outlaws - Late Models Dirt Late Models | Results | | A.J. Diemel (Dirt Super Late Models) | 3rd | 8th | - | - | | A.J. Diemel (Dirt Late Models) | 1st | - | - | 3rd |
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| 8/7/2021 | Cedar Lake Speedway - New Richmond, WI 34th Annual USA Nationals Night 3 Dirt Super Late Models: World of Outlaws - Late Models Dirt Late Models | Results | | A.J. Diemel (Dirt Super Late Models) | - | - | - | 18th |
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| 8/13/2021 | Red Cedar Speedway - Menomonie, WI Structural Buildings WISSOTA Late Model Challenge Series WISSOTA Late Model: Wissota Late Model Challenge Series WISSOTA Modifieds, WISSOTA Street Stock, WISSOTA Super Stock | Results | | A.J. Diemel (WISSOTA Late Model) | 3rd | - | - | 4th |
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| 8/20/2021 | Mississippi Thunder Speedway - Fountain City, WI Rumble by the River 40 Dirt Late Models, USRA B-Mods, USRA Modifieds, USRA Hobby Stocks | Results | | A.J. Diemel (Dirt Late Models) | 5th | - | - | 10th |
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| 9/9/2021 | River Cities Speedway - Grand Forks, ND Prelude to the Johnny - NLRA Late Model Tour Championship B Modifieds, WISSOTA Midwest Mods, WISSOTA Late Model, WISSOTA Street Stock | Results | | A.J. Diemel (WISSOTA Late Model) | 1st | - | - | 1st |
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| 9/10/2021 | River Cities Speedway - Grand Forks, ND John Seitz Memorial Night 1 & Wayne Anderson Cup Finale 410 Sprints - Winged: Northern Outlaw Sprint Association B Modifieds, WISSOTA Midwest Mods, WISSOTA Modifieds, WISSOTA Late Model, WISSOTA Street Stock | Results | | A.J. Diemel (WISSOTA Late Model) | 1st | 2nd | - | 1st |
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| 9/16/2021 | Cedar Lake Speedway - New Richmond, WI 16th Annual Legendary 100 Night 1 Limited Sprints - Winged: Upper Midwest Sprint Car Series 360 Sprints - Non-Winged: Traditional Sprint Car Series A Modifieds, Midwest Modifieds, Street Stocks, Dirt Late Models, 305 Sprints - Non-Winged, Pony Stock, Super Stocks, Pure Stock, USRA Late Models, WISSOTA Midwest Mods | Results | | A.J. Diemel (A Modifieds) | - | - | - | - | | A.J. Diemel (Dirt Late Models) | - | - | - | 1st |
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| 9/17/2021 | Cedar Lake Speedway - New Richmond, WI 16th Annual Legendary 100 Night 2 Limited Sprints - Winged: Upper Midwest Sprint Car Series 360 Sprints - Non-Winged: Traditional Sprint Car Series A Modifieds, Midwest Modifieds, Street Stocks, Dirt Late Models, 305 Sprints - Non-Winged, Pony Stock, Super Stocks, Pure Stock, USRA Late Models, WISSOTA Midwest Mods | Results | | A.J. Diemel (A Modifieds) | - | - | - | 1st |
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| 9/18/2021 | Cedar Lake Speedway - New Richmond, WI 16th Annual Legendary 100 Night 3 Limited Sprints - Winged: Upper Midwest Sprint Car Series 360 Sprints - Non-Winged: Traditional Sprint Car Series A Modifieds, Midwest Modifieds, Street Stocks, Dirt Late Models, 305 Sprints - Non-Winged, Pony Stock, Super Stocks, Pure Stock, USRA Late Models, WISSOTA Midwest Mods | Results | | A.J. Diemel (A Modifieds) | - | - | - | 5th | | A.J. Diemel (Dirt Late Models) | - | - | - | 1st |
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| 9/24/2021 | Red Cedar Speedway - Menomonie, WI 41st Annual Punky Manor Challenge of Champions Night #1 Heats WISSOTA Midwest Mods, WISSOTA Modifieds, WISSOTA Late Model, WISSOTA Street Stock, WISSOTA Super Stock | Results | | A.J. Diemel (WISSOTA Modifieds) | 1st | - | - | - | | A.J. Diemel (WISSOTA Late Model) | 1st | - | - | - |
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| 9/25/2021 | Red Cedar Speedway - Menomonie, WI 41st Annual Punky Manor Challenge Of Champions Features & Hall of Fame Induction WISSOTA Midwest Mods, WISSOTA Modifieds, WISSOTA Late Model, WISSOTA Street Stock, WISSOTA Super Stock | Results | | A.J. Diemel (WISSOTA Modifieds) | 1st | - | - | 2nd | | A.J. Diemel (WISSOTA Late Model) | 1st | - | - | 2nd |
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| 10/1/2021 | ABC Raceway - Ashland, WI Red Clay Classic A Modifieds, WISSOTA Midwest Mods, WISSOTA Modifieds, WISSOTA Late Model, WISSOTA Super Stock | Results | | A.J. Diemel (WISSOTA Modifieds) | 3rd | - | - | 4th | | A.J. Diemel (WISSOTA Late Model) | 1st | - | - | 1st |
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