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| 4/17/2021 | Hamilton County Speedway - Webster City, IA Malvern Bank $3,000-to-Win Late Models Dirt Super Late Models: SLMR Late Model Series USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Parker Slagle (USRA Stock Cars) | 5th | - | - | 18th |
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| 4/24/2021 | Hamilton County Speedway - Webster City, IA Modified Madness $2,000-to-Win Mods A Modifieds, USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Parker Slagle (USRA Stock Cars) | 1st | - | - | 7th |
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| 4/30/2021 | Hancock County Speedway - Britt, IA Weekly Racing - Point Invert Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Sport Compact | Results | | Parker Slagle (Stock Cars) | 4th | - | - | 7th |
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| 5/7/2021 | Sports Park Raceway - Fort Dodge, IA Season Opener USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Parker Slagle (USRA Stock Cars) | 5th | - | - | 7th |
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| 5/14/2021 | Sports Park Raceway - Fort Dodge, IA Summit USRA Weekly Racing Series USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Parker Slagle (USRA Stock Cars) | 2nd | - | - | 1st |
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| 5/15/2021 | Hamilton County Speedway - Webster City, IA Kid's Night + $1,000-to-Win Mods USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Parker Slagle (USRA Stock Cars) | 2nd | - | - | 22nd (DNF) |
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| 5/22/2021 | Hamilton County Speedway - Webster City, IA Bob Flaws Memorial + Stock Car Challenge $1,600-to-Win USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Parker Slagle (USRA Stock Cars) | 3rd | - | - | 8th |
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| 6/4/2021 | Sports Park Raceway - Fort Dodge, IA Summit USRA Weekly Racing Series USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Parker Slagle (USRA Stock Cars) | 2nd | - | - | 8th (DNF) |
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| 7/16/2021 | Sports Park Raceway - Fort Dodge, IA Summit USRA Weekly Racing Series B Modifieds, USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Parker Slagle (USRA Stock Cars) | 4th | - | - | 1st |
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| 7/17/2021 | Hamilton County Speedway - Webster City, IA Casey's Salute The Troops + HCPOA Night Dirt Super Late Models, USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Parker Slagle (USRA Stock Cars) | 3rd | - | - | 9th (DNF) |
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| 7/21/2021 | Hamilton County Speedway - Webster City, IA Wildcard Wednesday Presented by Peoples Credit Union Dirt Super Late Models, USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Parker Slagle (USRA Stock Cars) | 1st | - | - | 10th |
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| 7/24/2021 | Hamilton County Speedway - Webster City, IA Kids Night At The Fair Presented by Good Life RV Dirt Super Late Models, USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Parker Slagle (USRA Stock Cars) | 1st | - | - | 8th |
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| 7/31/2021 | Hamilton County Speedway - Webster City, IA USRA Weekly Racing Presented by D&B Agro USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Parker Slagle (USRA Stock Cars) | 3rd | - | - | 4th |
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| 8/6/2021 | Hancock County Speedway - Britt, IA Annual Night of 1,000 Stars - $3,000 to WIN Modifieds Sponsored BY JAKS PUPPIES Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Sport Compact, IMCA Modified | Results | | Parker Slagle (Stock Cars) | 5th | - | - | 17th |
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| 8/7/2021 | Hancock County Speedway - Britt, IA Annual Night of 10,000 Stars - $4,000 to WIN Modifieds Corteva Agriscience, Asmus Supply, Sents Seed Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, 600cc Modifieds, Sport Compact, IMCA Modified | Results | | Parker Slagle (Stock Cars) | 7th | - | - | 5th |
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| 8/27/2021 | Sports Park Raceway - Fort Dodge, IA Season Championship Night and Tuff Trucks Super Truck, USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Parker Slagle (USRA Stock Cars) | 4th (DNF) | - | - | 5th |
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| 8/28/2021 | Hamilton County Speedway - Webster City, IA Karl Chevrolet Driver Appreciation Night A Modifieds, USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Parker Slagle (USRA Stock Cars) | 6th | - | 2nd | 13th (DNF) |
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| 10/23/2021 | Hamilton County Speedway - Webster City, IA Fall Futurity Night #2 Dirt Super Late Models, USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Parker Slagle (USRA Stock Cars) | 9th (DNF) | - | - | 10th |
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