Nick Kyrgios has become known for his mercurial performances, but it is undoubted that he is capable of some sublime tennis when playing at his best.

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6-5 down against Kei Nishikori in the the first set of their Madrid Open quarter-final encounter, the Australian pulled off a simply incredible shot to turn things around.

With his Japanese opponent looking confident after a deft lob shot, the 21-year-old managed to hit through his own legs, and back over the world no. 6.

Wilson Tour Slam Strung Tennis Racquet, 4 1/4-Inch, Black/Green

Kyrgios went on to win the set 7-6, with Nishikori surely wondering how to beat the youngster after his amazing return.

The winner of this match will play either Novak Djokovic or Milos Raonic, who play later in the day.