Federer took defeat gracefully and speculated that the intense heat of the Arthur Ashe Arena in NY might have affected his performance.
He's suffered through the nightmares and now he's living the dream.
"John has the reputation for being one the hardest workers and I heard Roger say in an interview after his (third round) win that the players in the locker room respect John's work ethic".
Keys has reached at least the quarterfinals in three of the four Grand Slam tournaments this year. That self-doubt led him to consider retirement, and he described his city job as a "nice change of pace". I really like his team.
"I drove for ages through cane fields". I think that's all part of tennis, sharing the experiences with those close to you. "It was really dodgy".
John Millman of Australia shows his emotions.
In 2014, while resting after shoulder surgery, Millman worked for some months at a Brisbane financial services business.
That was the pits. In an essay, Millman wrote of his huge admiration from the Swiss, saying "I get asked a lot what Feds is like".
The Swiss tennis legend made plenty of unforced errors in the marathon match, so Millman acted as humbly as he could in victory.
"Now [US]$10,000 Futures are the lowest of the low". He reminds me of David Ferrer and those other guys that I admire a lot when I see them, when I see how they train, the passion they have for the game.
"The good thing is I managed to have a hit on it first time with Andy (Murray) before the tournament, so that was actually pretty cool".
"I learnt from it that you have to let people help you out". I still don't feel old, but at the same time, there is a little biological clock.
Then he started all over again, Millman's ranking spiralling outside the top 1000 again.
But Federer has been here before and defied his doubters.
As insurance, he completed a university degree and worked a day day job in finance to pay the bills. "I've never played anyone's reputation", he said.
"It's not for the money". While many players are appreciative of their fan following, Millman takes it to the next level, applauding his fans after matches. "Wished to play a little bit better tennis today, but wasn't the case".
"We all know that's been documented".
"I felt like a bit of a deer in headlights to begin with, to be honest with you, the feet weren't moving".
And how wrong they were as in his mid-30s he came back and played arguably the best tennis of his career on the way to the Australian Open and Wimbledon titles, claiming the "Sunshine Double" in Indian Wells and Miami and returning to world number one.
Even Federer knows it.
And the 31-year-old highlighted his two Wimbledon final wins but then opened up on the mental changes he had to make to his game. "Today he was definitely not at his best but I'll take it".
"He was like: 'Yeah, absolutely, I'm ready to come'". The pair spent a few days on court together in Stuttgart.
Millman continued to be rock solid off the ground in the third, especially off the backhand.
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