The hurt from disappointing defeats "does not get any easier" said Andy Murray after a subdued display against Japan's Taro Daniel saw him knocked out of the Australian Open in round two.
Britain's Murray lost 6-4 6-4 6-4 to qualifier Daniel - ranked below him at 120 in the world - on John Cain Arena.
"When you know you've not got many years left it is frustrating," he said.
"I put a lot into the off-season for practising and preparing, hopefully to not play like that in the big tournaments.
"So it is especially disappointing when you perform like that."
Former world number one Murray, now ranked 113th, had never previously lost a Grand Slam match to an opponent ranked as low as Daniel.
For 28-year-old Daniel, victory meant he reached the third round of a major for the first time in his career.
The three-time Grand Slam champion walked off court shaking his head before giving a quick thumbs up to a crowd glad to see him back at Melbourne Park and appreciative of his efforts.
Murray's exit was soon followed by defeat for Emma Raducanu, meaning Dan Evans is the final Briton left in the singles.