Kyrgios loves to play an attacking brand of tennis and hits the ball flat, which could pose problems for Federer if he is made to run around the court.
Nick Kyrgios maintains a unique record in tennis - he has defeated Rafael Nadal, Roger Federer, and Novak Djokovic in his very first encounter with each of the titans of tennis, not to mention his consecutive straight set victories against Djokovic.
American Jack Sock, seeded 17th, also advanced to the quarterfinals by rallying for a 4-6, 7-6 (1), 7-5 victory over Tunisia's Malek Jaziri in a match that lasted more than 2 1/2 hours.
"I don't take these decisions lightly, these are the matches we train for, but I'm in no fit state to take the court". I was beating myself down, and I just wasn't in a good place. Should Kyrgios defeat Federer as well, it could give us some big answers, thinks former doubles number one Todd Woodbridge.
Kyrgios broke Djokovic in the opening game and closed out the first set with his seventh ace of the match.
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Like his quarter-final opponent, Kyrgios has also not dropped a set enroute to the last-eight clash. "But most importantly, I won Australia". "Even I was at 13 (in the world) past year, but I wasn't in a good place mentally at all".
'I'm sorry to the fans that I'm unable to take ti the court but I have to put my health first and I hope you understand.
Nick Kyrgios returns a shot to Novak Djokovic during their match at the 2017 BNP Paribas Open tennis tournament at the Indian Wells Tennis Garden in Indian Wells, California, USA, 15 March 2017. He himself said in a post match interview that his mentality is improving, and is trying really hard to fight for every point and just compete. And although Kyrgios has showed his volatility many times during his short career, Djokovic, not Kyrgios, was the more unsettled and combustible man on Wednesday as the aces and winners again piled up in Kyrgios's favour.
"That was the best thing I could have done, come back and be with the boys, and I found some enjoyment practicing again", he said.
Mladenovic will play the victor of a later match between 12th-seeded Venus Williams and No. 14 Elena Vesnina.