The Pan Pacific Open (東レ パン・パシフィック・オープン・テニストーナメント), currently sponsored by Toray Industries, is an outdoor hardcourt tennis tournament held annually in Tokyo, Japan. It is a WTA Premier Tournament on the WTA Tour.The tournament was first held in 1976 as the Sillook Open in Tokyo. In 1982 it was renamed the TV Tennis Open and in 1983 it changed yet again to the Queens Grand Prix.