To a familiar mixture of cheers and boos, Denny Hamlin climbed onto his No. 11 Toyota’s doorsill and unfurled a blue flag emblazoned with “11 Against The World.” Waving it at the Martinsville Speedway crowd, Hamlin seemed to be celebrating his 55th Cup Series victory on Sunday while also taunting those who thought he was done winning on NASCAR’s premier circuit. For Hamlin, the triumphs often come amid turbulence, and the adversity (some self-induced) has been plentiful lately.