Federer to face Isner
Roger Federer will face John Isner in the second singles match on Friday when Switzerland takes on the United States in the first round of the Davis Cup.
Switzerland's 28th-ranked Stanislas Wawrinka opens the series against eighth-ranked Mardy Fish.
In Sunday's scheduled reverse singles, the third-ranked Federer is set to face Fish, followed by Wawrinka against the 17th-ranked Isner.
US captain Jim Courier is giving 19-year-old Ryan Harrison a Davis Cup debut on Saturday, partnering Mike Bryan in doubles against Federer and Wawrinka, who won Olympic gold in doubles in Beijing.
Bryan's twin brother Bob is unavailable after his first child was born last week.
The series will be played on indoor clay at the 7 000-capacity Fribourg Forum.