Andy Murray has withdrawn from the Barclays ATP World Tour Finals in London next month as he prioritises his recovery following back surgery.
The world number three went under the knife last month and it was expected he would not play again this season.
Murray said on atpworldtour.com: "I'm really disappointed not to be playing this year, I love playing in front of my home crowd, it's a great atmosphere.
"All the players look forward to competing in London and I'll be doing my best to qualify again for the tournament next year."
Murray first began struggling with a back problem during the 2012 clay-court season, and it flared up again on the same surface earlier this year.
The 26-year-old missed the French Open but went unbeaten on grass as he became the first British man in 77 years to win the singles title at Wimbledon.
It was clear, though, that the issue had not gone away, and he was unable to find his best form as his US Open title defence ended in a meek quarter-final defeat by Stanislas Wawrinka.
Soon after it was announced Murray would undergo a minor back procedure in attempt to clear up the problem for the 2014 season.
It is understood Murray's recovery is on schedule, and he saw his surgeon on Monday for the first time since the operation.
Provided he continues to make good progress, he is expected to travel to Miami for his winter training block in the middle of November, around a week earlier than usual.