Roger Federer will play John Isner on the opening day of Switzerland's Davis Cup tie against the USA.
The tie, being played on clay in Fribourg, is the pick of the first-round match-ups.
Federer v Fish will be Friday's second rubber after Switzerland's Stanislas Wawrinka has kicked things off by taking on Mardy Fish.
For Saturday's doubles rubber, the Swiss have nominated Federer and Wawrinka, while the USA, who are without Bob Bryan following the recent birth of his daughter, are due to field his twin brother Mike Bryan and youngster Ryan Harrison.
The reverse singles will follow on Sunday.
The Davis Cup is one prize 16-time Grand Slam champion Federer has yet to win.
A Federer-led Switzerland reached the semi-finals back in 2003 but lost out to Australia after Federer blew a two-set lead against Lleyton Hewitt in a crunch rubber.
Defending champion Serbia are without world number one Novak Djokovic for their home clash with Sweden but should still have few problems in reaching the last eight.
Janko Tipsarevic and Viktor Troicki have been chosen as their singles players for Friday's rubbers when both will start hot favourites in Nis.
Russia hand a debut to Alex Bogomolov against Austria. He will take on Andreas Haider-Maurer in the second rubber after Igor Kunitsyn has played Jurgen Melzer.
