Spain’s Rafael Nadal returns the ball to Czech Republic’s Lukas Rosol during their first round match at the Swiss Indoors tennis tournament at the St. Jakobshalle in Basel, Switzerland, 26 October 2015. EPA/GEORGIOS KEFALAS

Switzerland’s Roger Federer returns a ball to Kazakhstan’s Mikhail Kukushkin during their first round match at the Swiss Indoors tennis tournament at the St. Jakobshalle in Basel, Switzerland, 26 October 2015. EPA/GEORGIOS KEFALAS

Bulgaria’s Grigor Dimitrov returns a ball to Ukraine’s Sergiy Stakhovsky during their first round match at the Swiss Indoors tennis tournament at the St. Jakobshalle in Basel, Switzerland, 26 October 2015. EPA/GEORGIOS KEFALAS

The fans welcome Switzerland’s Roger Federer prior to his first round match against Kazakhstan’s Mikhail Kukushkin at the Swiss Indoors tennis tournament at the St. Jakobshalle in Basel, Switzerland, 26 October 2015. EPA/GEORGIOS KEFALAS

Donald Young of the USA returns the ball to Switzerland’s Henri Laaksonen during their first round match of the Swiss Indoors tennis tournament at the St. Jakobshalle in Basel, Switzerland, 26 October 2015. EPA/GEORGIOS KEFALAS