It was 3-1 for Rennes when teams played last time. Game will be competitive again, PSG has better players, but they just lost to Lens. A lot will depend on team's motivation to start well. They have class, but are clearly not in best shape yet after WC.
Rennes won this match here last year 3-1. PSG lost Super Cup to Lens recently. This match can be fun, but I think visitors will come out on top, having proper motivation this time.
PSG has extra motivation after losing the Super Cup to Lens. I expect reaction from a team and better start today. I think they will win both halves.