Belgium’s David Goffin returns to Canada’s Milos Raonic during their quarter final match at the Swiss Indoors tennis tournament at the St. Jakobshalle in Basel, Switzerland, 24 October 2014. EPA/GEORGIOS KEFALAS

Canada’s Milos Raonic serves to Belgium’s David Goffin during their quarterfinal match at the Swiss Indoors tennis tournament at the St. Jakobshalle in Basel, Switzerland, 24 October 2014. EPA/GEORGIOS KEFALAS

Spain’s Rafael Nadal prepares for service during his quarterfinal match against Croatia’s Borna Coric at the Swiss Indoors tennis tournament at the St. Jakobshalle in Basel, Switzerland, 24 October 2014. EPA/GEORGIOS KEFALAS

Switzerland’s Roger Federer serves to Bulgaria’s Grigor Dimitrov during their quarter final match at the Swiss Indoors tennis tournament at the St. Jakobshalle in Basel, Switzerland, 24 October 2014. EPA/GEORGIOS KEFALAS

Bulgaria’s Grigor Dimitrov (R) falls down during his quarterfinal match against Switzerland’s Roger Federer at the Swiss Indoors tennis tournament at the St. Jakobshalle in Basel, Switzerland, 24 October 2014. EPA/GEORGIOS KEFALAS

Spain’s Rafael Nadal serves to Croatia’s Borna Coric during their quarterfinal match at the Swiss Indoors tennis tournament at the St. Jakobshalle in Basel, Switzerland, 24 October 2014. EPA/GEORGIOS KEFALAS