Federer uncharacteristically lost his cool on several occasions during his thrilling three-set loss to Zverev, but managed to rally to save match points and force a third set before eventually succumbing to victory.
At one stage, he was docked a point for unsportsmanlike conduct
"He started to play much better every time he got something out of him", said Zverev.
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"You know, obviously I think emotions in sport are great. I didn't know what was happening with the umpire, didn't pay close attention, but, you know, every time he had an argument, he started playing better. Maybe it was a way to help him, as well, to get himself going.
"But, you know, he will always find a way. That's why he's the greatest player of all time, because he will, in difficult situations, difficult periods where his mind is maybe not at his best, he will still find a way to make it difficult for you."
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