The AP reports: Leon Powe scored a career-high 30 points with 11 rebounds, and Ray Allen added 22 points on Friday night to help the Boston Celtics snap a two-game losing streak and beat the Memphis Grizzlies 102-92… “Since he’s been put in a starting role, he’s been really playing well for us,” said Celtics swingman Paul Pierce, who scored 17… Rudy Gay scored 26, O.J. Mayo had 21 and Marc Gasol had 11 points and 15 rebounds for the Grizzlies, who have lost four consecutive games as they struggle to stay out of the Western Conference cellar… Stephon Marbury had his best game since joining the Celtics, scoring nine points with five assists.