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Laurent Gillieron, AP Photo/Keystone
Swiss Davis Cup tennis player Stanislas Wawrinka returns a ball to US player Mardy Fish during a Davis Cup World Group first round first match between Switzerland and the USA in the Forum Arena in Fribourg, Switzerland, Friday, Feb. 10, 2012.

FRIBOURG, Switzerland — The United States took a 1-0 lead against Switzerland in the first round of the Davis Cup on Friday when Mardy Fish beat Stanislas Wawrinka 6-2, 4-6, 4-6, 6-1, 9-7 in a thrilling opening match.

Fish fought back after wasting a match point chance at 5-4 in the deciding set. He won six games later with a crosscourt volley at the net.

The 86-minute final set was marked by wild shifts in momentum before the eighth-ranked American improved his record to 3-0 against the 28th-ranked Wawrinka.

Roger Federer was next on court in the best-of-five series in the World Group. The Swiss star was facing 17th-ranked John Isner before a crowd of 7,000 at Fribourg Forum.