Simona Halep of Romania hits a return against Duan Yingying of China during their women's singles second round match at the WTA Shenzhen Open tennis tournament in Shenzhen in China's southern Guangdong province on January 3, 2018. / AFP PHOTO / - / China OUT
Simona Halep is through to the Shenzhen Open quarter-finals after beating Duan Yingying on Wednesday. AFP

Simona Halep - the next undisputed No 1 of women's tennis or another Angelique Kerber?