"It's definitely grown into quite a rivalry, we would like to say. I don't know how they feel about that," Harbaugh said. "But we have tremendous respect for the New England Patriots. Their coaches, starting with their head coach, Bill Belichick, their quarterback, Tom Brady. … They just have a tremendous staff, tremendous players, tremendous tradition. It's always a huge challenge for us, but it's one we're excited about and look forward to."