Star free-agent forward LaMarcus Aldridge has agreed to sign a four-year, $80 million maximum contract with the San Antonio Spurs, league sources told Yahoo Sports. Aldridge, who turns 30 on July 19, had spent all nine seasons of his NBA career with the Portland Trail Blazers, developing into one of the league's best big men. He informed the Trail Blazers on Friday night that he had narrowed his choices to either the Spurs or Phoenix Suns, then chose the Spurs on Saturday morning.