ATLANTA — This was just what the Atlanta Hawks needed as they geared up for the playoffs: a chance to give the starters plenty of rest, while the backups put on quite a show. Tracy McGrady led six players in double figures and the Hawks, with perhaps their most impressive showing of the season, built a 37-point lead in the first half on the way to a 116-84 rout of the Detroit Pistons on Wednesday night. "That was a lot of fun," center Jason Collins said.