Lane Johnson (R) from the University of Oklahoma stands with NFL Commissioner Roger Goodell after being selected by the Philadelphia Eagles as the fourth overall pick in the 2013 National Football League (NFL) Draft at Radio City Music Hall in New York, April 25, 2013. REUTERS/Adam Hunger

2016 Rio Olympics - Tennis - Preliminary - Men's Singles Second Round - Olympic Tennis Centre - Rio de Janeiro, Brazil - 09/08/2016. Evgeny Donskoy (RUS) of Russia reacts during his match against David Ferrer (ESP) of Spain. REUTERS/Toby Melville

2016 Rio Olympics - Tennis - Preliminary - Men's Singles Second Round - Olympic Tennis Centre - Rio de Janeiro, Brazil - 09/08/2016. Andy Murray (GBR) of United Kingdom in action against Juan Monaco (ARG) of Argentina. REUTERS/Kevin Lamarque TPX IMAGES OF THE DAY.

2016 Rio Olympics - Tennis - Preliminary - Men's Singles Second Round - Olympic Tennis Centre - Rio de Janeiro, Brazil - 09/08/2016. David Ferrer (ESP) of Spain in action against Evgeny Donskoy (RUS) of Russia. REUTERS/Toby Melville

2016 Rio Olympics - Tennis - Preliminary - Men's Singles Second Round - Olympic Tennis Centre - Rio de Janeiro, Brazil - 09/08/2016. Evgeny Donskoy (RUS) of Russia in action against David Ferrer (ESP) of Spain. REUTERS/Toby Melville

2016 Rio Olympics - Tennis - Preliminary - Men's Singles Second Round - Olympic Tennis Centre - Rio de Janeiro, Brazil - 09/08/2016. David Ferrer (ESP) of Spain in action against Evgeny Donskoy (RUS) of Russia. REUTERS/Toby Melville

2016 Rio Olympics - Tennis - Preliminary - Men's Singles Second Round - Olympic Tennis Centre - Rio de Janeiro, Brazil - 09/08/2016. David Ferrer (ESP) of Spain reacts after losing his match against Evgeny Donskoy (RUS) of Russia. REUTERS/Toby Melville

2016 Rio Olympics - Tennis - Preliminary - Men's Singles Second Round - Olympic Tennis Centre - Rio de Janeiro, Brazil - 09/08/2016. Evgeny Donskoy (RUS) of Russia in action against David Ferrer (ESP) of Spain. REUTERS/Toby Melville