MILWAUKEE (AP) – General manager John Hammond has spent most of his summer rebuilding the Milwaukee Bucks roster. But he’s also made sure one of the holdovers sticks around for the future.  He signed center Larry Sanders to a four-year extension worth approximately $44 million.  The 24-year-old drafted in 2010 is coming off a breakout year. He led the Bucks with 9.5 rebounds per game and averaged a career-best 9.8 points. His 2.83 blocks per game were second in the NBA to Oklahoma City’s Serge Ibaka.  Sanders’ emotional play has made him a crowd-favorite at the Bradley Center. But he’s also been a target for officials, who ejected him a league-leading five times last season. New Bucks coach Larry Drew says he’s made it clear to Sanders that has to change.