Novak Djokovic, back from the wilderness with an unlikely Wimbledon triumph, has even better tennis in him, Swiss great Roger Federer says.
"I think he probably still has more left in him. I think he's playing well, but I think he can even play better," Federer said in Flushing Meadows this week as he prepared for Monday's start of the US Open.
Third-seeded Argentine Juan Martin del Potro also backed Djokovic to continue his rise back from a right elbow injury -- all the way back to number one in the world.
"I believe in him," del Potro said. "I know he has everything to win the first position in the world again.
"But I also know what he has been through to get into this position again. He had frustration with the injury. He leaves early in every tournament. It's not normal for a player like him."
"So I don't know if it's a mental thing there or actually the arm doesn't allow you to do it. It really depends on where you come from."
- Murray eyes return to top -
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"All injuries are completely different," he said. "Some are more serious than others. Someone is out for a few weeks with a muscle injury, it's very different to somebody recovering from a surgery on certain parts of the body."
Rather than look to other top players who have returned from injury to guide his comeback, Murray said he's "trying to deal with the situation that I've been in as best as I can myself."