 The Boston Celtics lost their NBA Summer League consolation game against the 76ers, 103-98 from Las Vegas. Jordan Walsh led the team in scoring with 18 points. Boston closed out exhibition play in Las Vegas with a 2-3 record. Meanwhile, the Celtics are doing everything they can to keep their championship roster intact. ESPN reporting yesterday that Sam Houser agreed to a four-year, $45 million contract extension. He was slated to become a free agent.