Responding after Nadal’s comments, Kyrgios seemed nonplussed.
«I’m different. Rafa’s different. He can focus on what he needs to do,» Kyrgios said.
«He doesn’t know the journey I’ve been through.
«He doesn’t know anything about me so I’m not going to listen at all.»
Kyrgios, one of the fastest players on tour between points, then took aim at Nadal, who is among the slowest.
«It’s the way I play. It’s the way he plays — he’s very slow between points and I think that the rule in the book is that you have to play to the speed of the server but Rafa has the speed every time,» Kyrgios said.
«I’m not going to comment on him, his game. I’ve got my game; he’s got his own game. We played well — that’s the sport.
«People are different — I’m not going to take that into consideration at all.»
A shot clock was introduced to tennis last year with a maximum of 25 seconds allowed between points, after the chair umpire’s announcement of the score.
There might be more controversy ahead for Kyrgios in Friday’s quarter-final against Stan Wawrinka.
Also in the last eight, Australian fifth seed Alex de Minaur faces Alexander Zverev and compatriot John Millman meets John Isner.