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| 5/31/2018 | Dakota State Fair Speedway - Huron, SD Iverson's Dakota Challenge - $5,000 to win WISSOTA Late Model Challenge Series WISSOTA Late Model: Wissota Late Model Challenge Series Midwest Modifieds, WISSOTA Modifieds, WISSOTA Street Stock | Results | | Kelly Duffy (WISSOTA Late Model) | 5th | - | - | 17th |
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| 6/2/2018 | Dakota State Fair Speedway - Huron, SD Prostrollo General Motors Challenge Cup XVIII - $10,000 to win WISSOTA Late Model Challenge Series WISSOTA Late Model: Wissota Late Model Challenge Series Midwest Modifieds, WISSOTA Midwest Mods | Results | | Kelly Duffy (WISSOTA Late Model) | 6th | - | 8th | - |
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| 6/16/2018 | Miller Central Speedway - Miller, SD Miller Central Speedway Pure Stock, WISSOTA Midwest Mods, WISSOTA Modifieds, WISSOTA Late Model, WISSOTA Street Stock, WISSOTA Super Stock | Rain Out |
| 7/7/2018 | Miller Central Speedway - Miller, SD Miller Central Speedway Pure Stock, WISSOTA Midwest Mods, WISSOTA Modifieds, WISSOTA Late Model, WISSOTA Street Stock, WISSOTA Super Stock | Results | | Kelly Duffy (WISSOTA Late Model) | 4th | - | - | 8th | | Kelly Duffy (WISSOTA Super Stock) | 1st | - | - | 6th |
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| 7/27/2018 | Brown County Speedway - Aberdeen, SD Bieglers C & S Motorsports Presents Advantage RV's Modified Tour with Fargo Force Super Stock Series Pure Stock, WISSOTA Midwest Mods, WISSOTA Modifieds, WISSOTA Late Model, WISSOTA Street Stock, WISSOTA Super Stock | Results | | Kelly Duffy (WISSOTA Super Stock) | 4th | - | - | 6th |
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| 7/28/2018 | Brown County Speedway - Aberdeen, SD Ken's Superfair Foods Presents Advantage RV's Modified Tour with Fargo Force Super Stock Series Pure Stock, WISSOTA Midwest Mods, WISSOTA Modifieds, WISSOTA Street Stock, WISSOTA Super Stock | Results | | Kelly Duffy (WISSOTA Super Stock) | 4th | - | - | 7th |
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| 8/17/2018 | Miller Central Speedway - Miller, SD Miller Central Speedway Two Day Special Pure Stock, WISSOTA Midwest Mods, WISSOTA Modifieds, WISSOTA Late Model, WISSOTA Street Stock, WISSOTA Super Stock | Results | | Kelly Duffy (WISSOTA Late Model) | 3rd | - | - | 10th | | Kelly Duffy (WISSOTA Super Stock) | 3rd | - | - | 3rd |
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| 8/18/2018 | Miller Central Speedway - Miller, SD Miller Central Speedway Two Day Special & Track Championship Pure Stock, WISSOTA Midwest Mods, WISSOTA Modifieds, WISSOTA Late Model, WISSOTA Street Stock, WISSOTA Super Stock | Results | | Kelly Duffy (WISSOTA Late Model) | 4th | - | - | 5th | | Kelly Duffy (WISSOTA Super Stock) | 2nd | - | - | 2nd |
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| 8/25/2018 | Miller Central Speedway - Miller, SD Miller Central Speedway 4th Annual Big Dog Race Pure Stock, WISSOTA Midwest Mods, WISSOTA Modifieds, WISSOTA Late Model, WISSOTA Street Stock, WISSOTA Super Stock | Results | | Kelly Duffy (WISSOTA Late Model) | 4th | - | - | 8th | | Kelly Duffy (WISSOTA Super Stock) | 1st | - | - | 4th |
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| 9/1/2018 | Miller Central Speedway - Miller, SD Miller Central Speedway Pure Stock, WISSOTA Midwest Mods, WISSOTA Modifieds, WISSOTA Late Model, WISSOTA Street Stock, WISSOTA Super Stock | Results | | Kelly Duffy (WISSOTA Late Model) | 7th | - | - | 11th | | Kelly Duffy (WISSOTA Super Stock) | 2nd | - | - | 2nd |
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| 9/8/2018 | Black Hills Speedway - Rapid City, SD Nationals 360 Sprints - Winged, Hobby Stocks, A Modifieds, WISSOTA Midwest Mods, WISSOTA Late Model, WISSOTA Street Stock, WISSOTA Super Stock | Results | | Kelly Duffy (WISSOTA Late Model) | 2nd | - | - | 4th | | Kelly Duffy (WISSOTA Super Stock) | 3rd | - | - | 3rd |
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| 9/22/2018 | Casino Speedway - Watertown, SD Autumn Classic - Going for the Good's - Night #1 Economy Late Models, WISSOTA Midwest Mods, WISSOTA Modifieds, WISSOTA Late Model, WISSOTA Street Stock, WISSOTA Super Stock | Results | | Kelly Duffy (WISSOTA Late Model) | 2nd | - | - | 6th | | Kelly Duffy (WISSOTA Super Stock) | 2nd | - | - | 3rd |
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| 9/23/2018 | Casino Speedway - Watertown, SD Autumn Classic - Going For The Goods - RAIN DATE WISSOTA Midwest Mods, WISSOTA Modifieds, WISSOTA Late Model, WISSOTA Street Stock, WISSOTA Super Stock | Results | | Kelly Duffy (WISSOTA Late Model) | 4th | - | - | 9th | | Kelly Duffy (WISSOTA Super Stock) | 4th | - | - | 5th |
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