Yes, he will play Rennes next. He doesn't sound so enthusiastic about it in his audio interview. "I don't mind, but well..."
He says he was tired in the 2nd set, it was quite obvious too. He felt like Paulo was dominating, he didn't have many solutions anymore, needed to shorten the points.
As for that horrible, horrible miss on SP in the 1st set, he was not sure if he should play it DTL or cross, so he hit it into the bottom of the net.
(DTL would have been the right answer imo!)
The level on the main tour seems not so far and far at the same time because he was playing at 100% all the time and the other guys probably not. And he also took advantage of the fact that some of them are tired at the end of the season. So he took his chance well on that tournament, but he'll remain "humble" and carry on with his "day-to-day existence" on the Challenger tour.
He still has a lot of things to work on: the condition, because he was tired today. The serve. Everything.