Nick Kyrgios says he relishes being the underdog in Saturday's US Open third-round match against five-time champion Roger Federer.
The Australian, then 20, beat Federer at the 2015 Madrid Open when the pair met for the first time.
He similarly beat Rafael Nadal and Novak Djokovic, who have a combined total of 30 Grand Slam titles, at the first time of asking.
"It's better to be the underdog than have all the pressure," he said.
"I'm going to put a lot of expectation on myself to play well. I'm not going to go out there and roll over and be happy to be out there.