No. 5 women's seed Caroline Wozniacki faded under the lights in a second-round match on Court 17 and was dismissed by Ekaterina Makarova of Russian Federation, 6-2, 6-7 (5), 6-1, Makarova's first victory in their eight head-to-head matchups.
"I'm not good enough for him", Kyrgios said bluntly. "It was scrappy tennis but sometimes those kind of matches are a lot of fun and this was one of those days".
He has little trouble, in fact, getting himself motivated to play the big guns.
Niggles have dogged Kyrgios in recent times, with the World No.18 now reporting injuries at his last five grand slams.
"... There are players out there that are more dedicated, that want to get better, that strive to get better every day, the one-percenters".
It was a shoulder injury that bugged him on this occasion, as Millman - ranked 218 places below him - won 6-3 1-6 6-4 6-1.
"I know Nick's shoulder deteriorated as the match went on, so it's a victory, but slightly hollow", said Millan. "Something didn't feel right in my arm".
In addition, Kyrgios received a code violation in the third set after a game in which he shouted something while looking at his bandaged finger.
When a reporter returned to that topic, asking Kyrgios to explain what he meant, he said: "I'm not dedicated to the game at all".
"I was playing basketball. every day for two hours".
Sharapova broke to open the third set and again for a 4-1 edge when Babos netted a forehand drop volley and again on match point when Babos sent a backhand wide.
The Australian crashed out to his compatriot John Millman in four sets in his opening match where he was suffering from a shoulder injury.
As he made a big show of his injury, he continued pounding hard serves, one that reached over 130 miles per hour. At the subsequent changeover he took a medical time-out, during which he told the trainer that his shoulder felt "dead and numb" and "incredibly weak all of a sudden".
Kyrgios said, nevertheless, that he had enjoyed success in the past despite his lack of dedication. "How can something happen all of a sudden?"
With full power, Kyrgios promptly obliterated his racquet, drawing a second code violation and a mandatory point penalty to start the fourth set.
Kyrgios and Federer last met in a three-set classic in the semi-finals of the Miami Open in Key Biscayne.
The Rio 2016 Olympian secured one of the most significant wins of his career after cashing in on Kyrgios's physical frailties to storm into the second round of the US Open for the first time.
"He's a teammate. He's a great guy on and off the court".
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