Switzerland’s Roger Federer in action against Spain’s Rafael Nadal during their final match at the Swiss Indoors tennis tournament at the St. Jakobshalle in Basel, Switzerland, 01 November 2015. EPA/DOMINIC STEINMANN

Spain’s Rafael Nadal in action against Switzerland’s Roger Federer during their final match at the Swiss Indoors tennis tournament at the St. Jakobshalle in Basel, Switzerland, 01 November 2015. EPA/GEORGIOS KEFALAS

Switzerland’s Roger Federer in action against Spain’s Rafael Nadal during their final match at the Swiss Indoors tennis tournament at the St. Jakobshalle in Basel, Switzerland, 01 November 2015. EPA/GEORGIOS KEFALAS

Spain’s Rafael Nadal in action against Switzerland’s Roger Federer during their final match at the Swiss Indoors tennis tournament at the St. Jakobshalle in Basel, Switzerland, 01 November 2015. EPA/DOMINIC STEINMANN

Switzerland’s Roger Federer (L) celebrates after winning against Spain’s Rafael Nadal (R) at the Swiss Indoors tennis tournament at the St. Jakobshalle in Basel, Switzerland, 01 November 2015. EPA/DOMINIC STEINMANN

Switzerland’s Roger Federer offers pizza to ball-boys after he won the final match against Spain’s Rafael Nadal at the Swiss Indoors tennis tournament at the St. Jakobshalle in Basel, Switzerland, on Sunday, November 1, 2015. EPA/KURT SCHORRER