Detroit rookie center Andre Drummond finished with 12 points, including a go-ahead layup late in the fourth quarter, and the Pistons held off the Toronto Raptors 101-to-99 in the preseason opener for both teams last night at the Palace of Auburn Hills. With Detroit down one with 35 seconds to play, Drummond, the Piston’s first-round pick out of Connecticut in the June draft, hit a big put-back bucket off a miss by Will Bynum to give the Pistons back the lead. Brandon Knight had 14 points and dished out six assists for Detroit while Greg Monroe added 17 points and grabbed 10 rebounds. The Pistons and Raptors will meet again tomorrow night in Toronto.