Brad Keselowski’s inspiration in his search for a first Sprint Cup championship Sunday comes from an unlikely place – the late Formula One kingpin Ayrton Senna. “One of my favorite movies in the whole wide world is the documentary on Ayrton Senna (“Senna”),” Keselowski said Thursday at Homestead-Miami Speedway, where the title will be decided Sunday. “There’s a really powerful scene that sticks with me. They were talking about him at Monaco, his phenomenal track where he was so strong. He had a huge lead over his teammate at the time. They were coming down to the closing laps of the race, and they told him to slow down, that he had a huge lead. And he wrecked...
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