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Regan Smith will replace Kyle Larson for STP 500 at Martinsville Speedway

Auto Club 400

Auto Club 400

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MARTINSVILLE, Va. -- Kyle Larson won’t race in the STP 500 at Martinsville Speedway after fainting during an autograph session at the track Saturday.

Xfinity Series driver Regan Smith, a Sprint Cup veteran who substituted for Kurt Busch in the first three races this season, will replace Larson in the No. 42 Chevrolet.

Chip Ganassi Racing Teams released a statement on Larson’s condition Sunday morning:

“After fainting yesterday at an autograph session in Martinsville, VA, Kyle Larson was first evaluated at a local hospital in Martinsville and ultimately evaluated at a Charlotte hospital. Although all tests came back negative and Larson feels completely fine, the doctors felt he should be held for more testing today. Subsequently, Larson will be unable to race today in the STP 500 in Martinsville. Regan Smith has agreed to fill-in for Larson today in the No. 42 Target Chevrolet SS.”