Nick Kyrgios concedes he "lost belief" after putting in an abject performance on Wimbledon's Centre Court in his fourth-round defeat to Andy Murray.
Fifteenth seed Kyrgios went into Monday's clash with world number two Murray in good form, having seen off Feliciano Lopez, Dustin Brown and Radek Stepanek in the earlier rounds.
Kyrgios was impressive during a high-quality first set but, after narrowly losing out to Murray, the Australian seemingly lost focus, eventually going down 7-5 6-1 6-4.
And 21-year-old Kyrgios did not hold back in his assessment of the match, saying: "It was a good first set. The rest of the match was pretty pathetic.
"I was really comfortable out there the first set. I thought I was playing some really good tennis. I believed that I could win the match.
"As soon as I lost the first set, I just lost belief. Obviously felt like a mountain to climb after losing the first.
"I think when things get tough, I'm just a little bit soft. I mean, I've got experience, but it ultimately comes down to just laying it all out there and competing for a long time.
"I didn't do that today at all."
Kyrgios revealed he played computer games in the lead-up to the match, while he was also seen on court 18 watching countryman Lleyton Hewitt in the men's doubles just a few hours before his own match.
When asked if he is applying all he has in his gut and heart to become the best professional he can, Kyrgios bluntly told the reporter: "No."
He added: "I don't love the sport. But, you know, I don't really know what else to do without it.
"I obviously like playing the game. It's a massive part of my life. But I don't know whether... I don't really know."