Yankees general manager Brian Cashman says it’s possible third baseman Alex Rodriguez, 37, could miss the season while recovering from Jan. 16 surgery to repair a torn labrum and reshape a bone in his left hip. Rehabilitation time was expected to be six months. New York signed righty David Robertson to a one-year, $3.1 million deal . . . Brewers first baseman Corey Hart had surgery to debride the joint surface and repair a small meniscal tear in his right knee. Estimated recovery time is 3-4 months . . . Free agent righty Carl Pavano, 37, ruptured his spleen in a fall while shoveling snow at his Vermont home and will need 6-8 weeks to recover, according to Foxsports.com.