Liz Mullen of the Sports Business Journal reports that Matt Cain's agents, Landon Williams and Rick Landrum, have joined CAA Sports and remain in talks with the Giants about a long-term extension. Williams and Landrum are now partnered with Buster Posey's agent Jeff Berry, who is assisting in negotiations with the Giants. Cain, who can become a free agent following the season, said earlier this month that he would like something resolved by the end of spring training.