Andy Murray says he is "not enjoying" his tennis after suffering an agonising opening-round defeat by Australian Alex de Minaur at the Paris Masters.
The 36-year-old fell 7-6 (7-5) 4-6 7-5 to the world number 13, who he has never managed to beat in six meetings.
Murray twice served for the match and missed match point in another gruelling contest lasting just over three hours.
"I'm not really enjoying it just now in terms of how I feel on the court and how I'm playing," Murray said.
"The last five, six months haven't been that enjoyable, so I need to try and find some of that enjoyment back because playing a match like that there's not much positivity there.