Dominic Thiem of Austria returns the ball to Australia’s James Duckworth during their first round match of the Brisbane International Tennis Tournament in Brisbane, Australia, 05 January 2016. EPA/DAVE HUNT

Carla Suarez Navarro of Spain reacts after defeating Samantha Stosur of Australia in their second round match of the Brisbane International Tennis Tournament in Brisbane, Australia, 05 January 2016. EPA/DAVE HUNT

Serena Williams of the USA reacts before withdrawing from her women’s singles match between the USA and Australia Gold in session 6 of the Hopman Cup tennis tournament at the Perth Arena in Perth, Australia, 05 January 2016. EPA/TONY MCDONOUGH

Alize Cornet of France returns the ball to Anastasia Pavlyuchenkova of Russia during their second round match of the Brisbane International Tennis Tournament in Brisbane, Australia, 05 January 2016. EPA/DAVE HUNT

Heather Watson (R) and Andy Murray (L) of Britain in action during their doubles match between Great Britain and France in session 4 of the Hopman Cup tennis tournament at the Perth Arena in Perth, Australia, 05 January 2016. EPA/TONY MCDONOUGH

Roberta Vinci of Italy celebrates winning her match against Dominika Cibulkova of Slovakia on day 3 of the Brisbane International Tennis Tournament in Brisbane, Australia, 05 January 2016. EPA/DAVE HUNT