Tokyo stocks opened lower on early Monday morning after the release of weaker-than-expected Japanese economic growth data. At 9:15 am, the 225-issue Nikkei Stock Average was down 5.23 points, or 0.04 percent, from Friday to 14,307.80. The broader Topix index of all First Section issues on the Tokyo Stock Exchange shed 4.01 points, or 0.34 percent, to 1,179. 81.