If Buster Posey wants to participate in the World Baseball Classic in spring training next year, the Giants wouldn't stand in his way. "I could envision him being one of the catchers on the U.S. team. I would think he would view it as an honor," said team president Larry Baer, who would have had a different opinion if the tournament were this past spring, when Posey was rehabbing his ankle. Baer and Mayor Ed Lee joined international baseball honchos at China Basin Park on Tuesday to promote the Giants-hosted WBC, which will conclude with the semifinals and final at their ballpark March 17-19.