Fed's got a lot left, hasn't bombed out early at any tournaments and has the most points since Toronto.
He just recently said he'll play better than he has also, well on that note we'll just have to see. There are areas he can improve, the serve is one area that can be improved and just needs to be worked on some. He lost some points because of it to Nole.
He's still pretty motivated and will be working hard.
Whether it's age, injuries or just not hitting the practice courts it doesn't matter.
He has shown a high level, higher than anyone else recently except Nole.
Don't expect him to lay down anytime soon.
It's not over yet, you can bet on it.