Corey Seager, the unanimous pick for NL Rookie of the Year in 2016, begins his second season as the Dodgers' shortstop confronted by one daunting question. ''He eliminates the noise,'' said Dodgers manager Dave Roberts, who sees a young player not easily distracted from the immediate task. Seager told Roberts that he didn't have his best swing last season, despite a .308 batting average and 26 home runs.