Thanks Miss Kitty.
As clearly stated in his post match press conference at the USO, he is using his PR
for three more tournaments (Tokyo, Moscow and St Petersburg) because he still had it available, so what the heck.
By the way, this thread was unnecessary. A quick glance at Justin's thread in the USA player forum or the Tokyo entry list thread would have answered this question without creating GM clutter.
Edit: He just defeated Lukasz Kubot 6-4, 7-5. It's the first main draw singles match that he's won since his back surgery.