The AP reports: Allen Iverson and the Detroit Pistons tightened up on defense to end their losing streak and prolong the agony of the Memphis Grizzlies. Iverson scored 27 points and helped Detroit limit Memphis to just four shots in the final quarter on the way to an 87-79 victory over the Grizzlies on Monday, ending the Pistons’ longest losing streak in five seasons. Rasheed Wallace scored 11 of his 13 points in the second half to help bring Detroit’s five-game skid to an end… O.J. Mayo and Rudy Gay led the Grizzlies with 15 points apiece and rookie center Marc Gasol had 12 points and 13 rebounds… The Grizzlies, who lost their sixth straight and for the 14th time in 16 games, missed 10 of their final 12 shots. They didn’t score after Mike Conley’s driving layup with 2:56 left.