Nick Kyrgios: 'I was in the zone'

Nick Kyrgios has claimed that he was "in a bit of a zone" during his upset of Rafael Nadal at Wimbledon on Tuesday.

The Australian, 19, caused arguably the surprise of the tournament so far when he defeated the world number one in the fourth round.

"I was in a bit of a zone out there and didn't really notice the crowd," Kyrgios told BBC Sport. "I was struggling a little on return but I worked my way into it and I served really well throughout, so am very happy.

"You have to believe that you can win the match from the start and I definitely did. I am playing really well on grass."

Kyrgios, ranked 144th in the world, returns to action today when he faces Milos Raonic in the quarter-finals.