Nikkei opened flat Friday, up 0.07 percent to 9,551.42. At 9:15 a.m., the 225-issue Nikkei Stock Average was up 6.26 points, or 0.07 percent, to 9,551.42. The broader Topix index of all First Section issues on the Tokyo Stock Exchange was up 0.85 point, or 0.11 percent, at 789.59.