Spurs give Duncan 2-year, $40M extension

Tim Duncan has agreed to a two-year, $40 million contract extension with the San Antonio Spurs, an official familiar with the negotiations said Tuesday. The agreement will add to Duncan’s existing three-year deal and keep him in San Antonio at least through the 2011-12 season, according to the official, who spoke on condition of anonymity because the source was not authorized to discuss…