The AP reports: The Grizzlies’ youth movement is starting to show results. Memphis won its fourth straight game Sunday, beating the Miami Heat 102-86. Rookie O.J. Mayo had 28 points, and Rudy Gay added 18… Memphis’ winning streak is its longest since the five games of the 2005-06 season. Darko Milicic matched his season high with 13 points, and reserve Mike Conley had 12 for the Grizzlies, who at times have started three rookies—Mayo, Marc Gasol and Darrell Arthur. Eight of Memphis’ 14 players are 23 or younger… Memphis has scored at least 100 points in all four wins during the run and has turned up the defensive pressure. On Sunday, the Miami star Dwyane Wade was 5-of-16 from the field and the Heat shot 36 percent… Michael Beasley led Miami with 20 points, and Joel Anthony had 12 points and 13 rebounds for his first double-double of the season.