just a note : after his match against Kim yesterday, Simon said that he still felt the pain in his knee.
he's played with that pain for a long time now and it's still there.
As for the match against Korolev, I didn't see it but I can imagine easily that Korolev made great shots but got annoyed and could lose his focus when Simon caught the ball back several times.
I think it is tendonitis? In which case, this is probably going to plague him for the rest of his career. Even if he manages his schedule well, he probably still needs to train quite hard to maintain his playing ability and focus...
Well, you are correct again with the result, but I deserve half a point for predicting a stern test by Korolev this time.