Denny Hamlin Admits NASCAR Team Must Improve After Frustrating Charlotte Finish

Denny Hamlin spent the opening portion of Sunday’s Bank of America 400 looking like a driver capable of winning at Charlotte Motor Speedway. By the checkered flag, he was wondering where all that speed had gone.The Joe Gibbs Racing veteran finished fifth, salvaging a top-five result despite pit-road trouble, a run-in with championship rival Kyle Larson and a No. 11 Toyota that gradually lost its advantage as track conditions changed.For a driver chasing his first NASCAR Cup Series champion