Don Mattingly and the Dodgers are moving toward a contract extension, according to a person familiar with the situation who spoke under the condition of anonymity because the deal hasn’t been finalized. Mattingly, 52, is under contract for only next season. His deal became guaranteed for 2014 when the Dodgers advanced to the National League Championship Series. Mattingly was uncomfortable with his lame-duck status last year, something he voiced in an awkward October news conference in which he said he might not return next season. At baseball’s winter meetings last month, Mattingly said he stood by what he said in October. However, Mattingly described himself as “comfortable” and said he was satisfied with the nature of his conversations with the team’s owners. Mattingly is 260-225 in his three seasons as the Dodgers manager. Mattingly won his first division title last year, when the Dodgers overcame a slow start to finish 92-70.