Simona Halep of Romania hits a return to Andrea Petkovic of Germany during their women’s third round singles match in the China Open tennis tournament at the National Tennis Center in Beijing, China 02 October 2014. EPA/ROLEX DELA PENA

Milos Raonic of Canada returns to Jurgen Melzer of Austria during their singles second round match at the Japan Open Tennis Championships in Tokyo, Japan, 02 October 2014. EPA/KIYOSHI OTA

Andrea Petkovic of Germany serves against Simona Halep of Romania during their women’s third round singles match in the China Open tennis tournament at the National Tennis Center in Beijing, China, 02 October 2014. EPA/ROLEX DELA PENA

Donald Young of the US returns to Kei Nishikori of Japan during their singles second round match at the Japan Open Tennis Championships in Tokyo, Japan, 02 October 2014. EPA/KIYOSHI OTA

Rafael Nadal (front) of Spain adjusts his headband as fans behind him watch during a men’s second round singles match agianst Peter Gojowczyk of Germany in the China Open tennis tournament at the National Tennis Center in Beijing, China 02 October 2014. EPA/ROLEX DELA PENA

Serena Williams of the USA reacts during her women’s third round singles match against Lucie Safarova of Czech Republic for the China Open tennis tournament at the National Tennis Center in Beijing, China 02 October 2014. EPA/ROLEX DELA PENA

Andy Murray of Great Britain reacts during a men’s second round singles match against Pablo Cuevas of Uruguay in the China Open tennis tournament at the National Tennis Center in Beijing, China 02 October 2014. EPA/ROLEX DELA PENA