"I really I was able to mix up my game nicely, make it hard for him". At the same time, have fun with my game, play variation, but for the most part try to stay on the offensive, as well.
Federer, who had looked slightly off his game in his rain-disrupted third round match against Federico Delbonis, was his dominant self on Monday, winning 89 percent of his first service points while cracking six aces to just one double fault.
Djokovic said he felt like it was his "first match" on tour and was unable to explain his opening set stumble or his capitulation in the decider.
"He hasn't got the biggest serve out there so you get a lot of looks to break and when you have momentum on your side - not only serving but from the baseline, things go very quickly".
Surprisingly, the Serb was able to break straight back when Federer wobbled slightly, and he then held his nerve brilliantly to claim the consolidating hold and move to 2-2.
"It's been a long time since I have been interrupted at night and have to come back the next day", Federer said.
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"You've got to be ready for it". We wait, we play, we wait again, we play again. There is still plenty of good enough players around me to cause an upset.
"At the Masters 1000s, when the format was different, it was the best-of-five-set finals in the finals".
"I think that would be a mistake". Playing three matches in a row.
New York Times tennis writer Christopher Clarey said the Serbian's "crisis continues" as he searches for his first grand slam title since the French Open in 2016.
The 36-year-old Swiss will face Frenchman Jeremy Chardy next after he beat Adrian Mannarino 7-5 4-6 6-1.
Elsewhere in the tournament, fifth-seed Dominic Thiem was forced to retire with an ankle injury.
Federer, the defending champion and five-time victor, needed just 58 minutes to wrap up a 6-2 6-1 victory. He was trailing Pablo Cuevas 6-3 4-6 2-4.