Andy Murray will miss Great Britain's Davis Cup tie against Russia at Coventry's Ricoh Arena on 5-7 April to focus on the clay season.
The Australian Open finalist has decided to concentrate on his weakest surface immediately after the hard-court tournaments in Indian Wells and Miami have been completed in March.
Murray's absence is a big blow to Britain's hopes of climbing back into the world group, as if they win the Russia tie, they head into a play-off to rejoin the elite.
Murray has pledged to play for the team in September and the world No 3 said: "It's a shame to miss out on the Davis Cup, as I always enjoy playing. I speak to [the Great Britain captain] Leon Smith and the team on a regular basis and will definitely be available to play the next Davis Cup tie later this year."
Smith said: "We totally understand Andy's position. He has worked extremely hard on his game, elevating it to another level, and we have all seen the fruits of that since Wimbledon.
"Andy's success continues to inspire more and more young people to take up the sport and we look forward to welcoming him back into the team in September."