Larson and Grant

Larson and Grant

Kyle Larson (69) leads Justin Grant en route to a $15,000 victory in the USAC AMSOIL National Sprint Car Series Ultimate Challenge Tuesday at Southern Iowa Speedway. (Dick Ayers Photo)

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Dave Darland (11) battles Thomas Meseraull during the USAC AMSOIL National Sprint Car Series Ultimate Challenge at Southern Iowa Speedway. (Dick Ayers Photo)

Dave Darland (11) battles Thomas Me...

Kyle Larson (69) leads Justin Grant en route to a $15,000 victory in the USAC AMSOIL National Sprint Car Series Ultimate Challenge Tuesday at Southern Iowa Speedway. (Dick Ayers Photo)

Kyle Larson (69) leads Justin Grant...

Chase Stockon (32) tries to overtake Bryan Clauson during action at Southern Iowa Speedway Tuesday. (Dick Ayers Photo)

Chase Stockon (32) tries to overtak...

Kyle Larson takes the checkered flag to win his second-straight USAC Ultimate Challenge at Southern Iowa Speedway Tuesday evening. (Dick Ayers Photo)

Kyle Larson takes the checkered fla...

Kyle Larson celebrates in victory lane after winning the Ultimate Challenge at Southern Iowa Speedway. (Hein Brothers Photo)

Kyle Larson celebrates in victory l...

Bryan Clauson (7), Damion Gardner (71) and Chase Stockon go three-wide during USAC AMSOIL National Sprint Car Series competition Tuesday at Southern Iowa Speedway in Oskaloosa, Iowa. (Hein Brothers Photo)

Bryan Clauson (7), Damion Gardner (...