The most spectacular part?
After powering past Kyrgios 6-4, 6-1, 7-5 to reach the fourth round of the US Open, Federer, obviously was questioned about the shot.
"It was nearly unreal", he said.
Photographers also captured Kyrgios's reaction to Federer's genius, while the player's open-mouthed response has also been immortalized in a gif.
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Things would have been much different if Kyrgios could have converted one of four break points in the seventh game of the opening set.
Kyrgios dropped seven straight games during a stretch from 4-4 in the first set to 5-0 in the second set.
The Swiss star was asked after the match what other players, including Kyrgios, might be able to learn from how Federer conducts himself on court. He doesn't have a coach and wondered aloud, during the latest in a long line of news conferences that sound more like therapy sessions, whether he should add one - or perhaps someone who could help with the mental aspect of the game. "But that's just how he plays".
"Today I think he didn't come up with the goods when he really had to, and I was good, I think, by making him hit that extra shot".
For many, his visit to NY this year was his tennis career in a nutshell.
The No. 2-seeded Federer moved into the fourth round at Flushing Meadows for the 17th consecutive appearance.
Federer commenced his US Open campaign with a comfortable 6-2 6-2 6-4 victory under the lights on Arthur Ashe over Yoshihito Nishioka, who despite a commendable effort, was thoroughly outclassed.
First, though, both get what shape up as mismatches in the fourth round: Federer plays 55th-ranked John Millman, and Djokovic faces 68th-ranked Sousa. "Against Roger, you're not going to get many".
The second-seeded Federer advanced to the Round of 16 with the victory. Maria Sharapova's name recognition made her upset of Jelena Ostapenko a little less notable than it may have been otherwise, but No. 4 Angelique Kerber was also ousted by No. 29 Dominika Cibulkova, absolutely draining the women's side of top Grand Slam experience. While 2017 US Open finalist Madison Keys held off a unsafe Aleksandra Krunic in three sets, the same could not be said of Wimbledon champion Angelique Kerber, No. 6 seed Caroline Garcia and Cincinnati Open finalist Kiki Bertens.
Kohlschreiber will seek a quarter-final berth against 2014 runner-up Kei Nishikori after the Japanese downed Argentine Diego Schwartzman 6-4, 6-4, 5-7, 6-1.
Kyrgios started as the entertainer but it was now Federer putting on the show, the 20-times major victor flicking a sublime backhand victor then rifling a forehand cross court to charge to 5-0 before seizing a two-sets-to-love lead with his 10th ace.