Watched this match and indeed, Youzhny looks done. He can still produce good shots, but he has zero consistency, no more punch in his shots. He was sometimes annoyed but other times he gave no reaction whatsoever.
Also I could be wrong but I think there was no one from his team in the stands. At least I'm sure Sobkin wasn't there and it looked like there was no one else.
After the final ball he shook hands quickly and without any interest, picked up his bag and rushed off court, with a blank expression on his face. Just strange to see.