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| 5/1/2015 | St. Croix Speedway - St. Croix Falls, WI Season Opener for Micro Sprints Winged Outlaw: Minnesota Micro Sprints Vintage Modifieds: Northern Vintage Stockcar Racers DIRTcar Sport Compact, Stock Cars, Winged A-Class, B Modifieds, Vintage Full Body Stock Cars | Results | | David Mastell (B Modifieds) | 5th | - | - | 6th |
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| 5/8/2015 | St. Croix Speedway - St. Croix Falls, WI Season Opener for Traditional Sprints Winged Outlaw: Minnesota Micro Sprints 360 Sprints - Non-Winged: UMSS - Traditional Sprint Car Series DIRTcar Sport Compact, Stock Cars, A Modifieds, B Modifieds | Results | | David Mastell (B Modifieds) | 3rd | - | - | 4th |
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| 5/22/2015 | St. Croix Speedway - St. Croix Falls, WI 4th Annual DaveyTabor Memorial Winged Outlaw: Minnesota Micro Sprints 360 Sprints - Non-Winged: UMSS - Traditional Sprint Car Series 360 Sprints - Winged, DIRTcar Sport Compact, Stock Cars, Winged A-Class, B Modifieds | Results | | David Mastell (B Modifieds) | 4th | - | - | 13th (DNF) |
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| 6/5/2015 | St. Croix Speedway - St. Croix Falls, WI Winged Outlaw: Minnesota Micro Sprints 360 Sprints - Non-Winged: UMSS - Traditional Sprint Car Series Vintage Modifieds: Northern Vintage Stockcar Racers DIRTcar Sport Compact, Stock Cars, A Modifieds, B Modifieds, Vintage Full Body Stock Cars | Results | | David Mastell (B Modifieds) | 2nd | - | - | 3rd |
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| 6/12/2015 | St. Croix Speedway - St. Croix Falls, WI Winged Outlaw: Minnesota Micro Sprints 360 Sprints - Non-Winged: UMSS - Traditional Sprint Car Series DIRTcar Sport Compact, Stock Cars, A Modifieds, Winged A-Class, B Modifieds | Results | | David Mastell (B Modifieds) | 3rd | - | - | 3rd |
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| 6/19/2015 | St. Croix Speedway - St. Croix Falls, WI Winged Outlaw: Minnesota Micro Sprints 360 Sprints - Non-Winged: UMSS - Traditional Sprint Car Series DIRTcar Sport Compact, Stock Cars, A Modifieds, B Modifieds | Results | | David Mastell (B Modifieds) | 4th | - | - | 4th |
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| 6/26/2015 | St. Croix Speedway - St. Croix Falls, WI Winged Outlaw: Minnesota Micro Sprints 360 Sprints - Non-Winged: UMSS - Traditional Sprint Car Series DIRTcar Sport Compact, Stock Cars, A Modifieds, B Modifieds | Results | | David Mastell (B Modifieds) | 5th | - | - | 6th |
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| 7/3/2015 | St. Croix Speedway - St. Croix Falls, WI Winged Outlaw: Minnesota Micro Sprints 360 Sprints - Non-Winged: UMSS - Traditional Sprint Car Series Vintage Modifieds: Northern Vintage Stockcar Racers DIRTcar Sport Compact, Stock Cars, B Modifieds, Vintage Full Body Stock Cars | Results | | David Mastell (B Modifieds) | 1st | - | - | 10th (DNF) |
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| 7/17/2015 | St. Croix Speedway - St. Croix Falls, WI Winged Outlaw: Minnesota Micro Sprints 360 Sprints - Non-Winged: UMSS - Traditional Sprint Car Series DIRTcar Sport Compact, Stock Cars, A Modifieds, B Modifieds | Results | | David Mastell (B Modifieds) | 2nd | - | - | 3rd |
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| 7/24/2015 | St. Croix Speedway - St. Croix Falls, WI 3rd Annual UMSS Dan Grams Memorial Winged Outlaw: Minnesota Micro Sprints 360 Sprints - Non-Winged: UMSS - Traditional Sprint Car Series 360 Sprints - Winged, DIRTcar Sport Compact, Stock Cars, Winged A-Class, B Modifieds | Results | | David Mastell (B Modifieds) | 1st | - | - | 6th |
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| 7/31/2015 | St. Croix Speedway - St. Croix Falls, WI Winged Outlaw: Minnesota Micro Sprints 360 Sprints - Non-Winged: UMSS - Traditional Sprint Car Series DIRTcar Sport Compact, Stock Cars, Winged A-Class, B Modifieds | Results | | David Mastell (B Modifieds) | 5th | - | - | 8th |
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| 8/14/2015 | St. Croix Speedway - St. Croix Falls, WI Winged Outlaw: Minnesota Micro Sprints 360 Sprints - Non-Winged: UMSS - Traditional Sprint Car Series DIRTcar Sport Compact, Stock Cars, B Modifieds | Results | | David Mastell (B Modifieds) | 3rd | - | - | 4th |
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| 8/28/2015 | St. Croix Speedway - St. Croix Falls, WI 4th Annual Open Wheel Nationals 360 Sprints - Winged: Sprint Invaders 360 Sprints - Non-Winged: UMSS - Traditional Sprint Car Series A Modifieds, B Modifieds | Results | | David Mastell (B Modifieds) | 2nd | - | - | 13th |
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