Swiss Davis Cup team captain Severin Luthi (C) and teammates (L to R) Marco Chiudinelli, Roger Federer, Stan Wawrinka and Michael Lammer attend a press conference on November 18, 2014 in Villeneuve-d'Ascq, northern France, prior to the Davis Cup tennis tournament final against France on November 21-23, 2014. Switzerland's hopes of a first ever Davis Cup win lay in the balance as the team awaited word on just how badly Roger Federer had injured his back ahead of this week's final against France in Lille.  AFP PHOTO / PHILIPPE HUGUEN        (Photo credit should read PHILIPPE HUGUEN/AFP/Getty Images)