Hamlin: Grudges 'take so much effort'

Hamlin and Keselowski, the 2012 NASCAR Sprint Cup Series champion, had an on-track incident in October's race at Charlotte that had Hamlin tailing Keselowski through the garage following the event. Keselowski was also involved in an altercation with Hamlin's JGR teammate Matt Kenseth the same night, and was part of a post-race free-for-all with Jeff Gordon and Kevin Harvick after the Chase race at Texas Motor Speedway .

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