World number one Novak Djokovic faces a battle to progress to the fourth round at Wimbledon, and Roger Federer believes it's only a matter of time before the Serb comes unstuck.
The two greats enjoyed contrasting fortunes on Friday, with Federer making light work of Daniel Evans in a 6-4, 6-2, 6-2 victory, while Djokovic will resume his third round match with Sam Querrey two sets down after the American grabbed a 7-6 (8-6), 6-1 advantage before play was called off for the day.
Should Djokovic fail to recover against Querrey, he'll see his bid for a fifth consecutive grand slam, and a calendar Grand Slam ended, while his run of 30 straight wins at grand slams will also come to a halt.
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However, one only has to think back to the top seed's dramatic comeback from two sets down against Kevin Anderson at Wimbledon last year to know that the Serb is far from out of it. Despite this, Federer believes that Djokovic's incredible run could soon be brought to a close.
"I know we get carried away, we think it's impossible to beat him [Djokovic], all these things," said the Swiss. "Clearly he's beatable. It's not impossible.
"He cannot win straight 200 matches in tennis. It's not possible. You're going to have your losses. But he hasn't lost. That's the great thing for him. He can fight his way out of it.
"It will be a different day [on Saturday]. Maybe very windy, a different game. It's still a long way away for Sam to get it done, especially with Novak's track record right now in the slams. They both know that. It will be an interesting match from now on clearly, to see how Novak is going to come back from this."
While Djokovic will have his work cut out for him trying to make it into the second week, Federer will be taking a well deserved break.
"I might take a day off [on Saturday] just because I can," he said. "I'm sorry, I have to take them when I can. I'm an old guy. I'm looking forward to it.
"On Sunday I'll practice with more intensity, to keep that intensity, play points, go to the gym again. Tomorrow it's relax, and Monday hopefully I'll have great energy when I come back."