PHILADELPHIA -- Luke Williams raced around the bases. His mind tried to keep up. How could he possibly comprehend what happened to him in the ninth inning on Wednesday night at Citizens Bank Park? How could he possibly absorb everything that happened to him in the past week? Williams hit a two-out, walk-off home run to left field in a 2-1 victory over the Braves to become the first player in Phillies history to hit a walk-off home run in his first big league start.