READ MORE: Going not-so green

Aleksandra Krunic of Serbia hits a return against Zhang Shuai of China during the women's singles final at the WTA Guangzhou Open tennis tournament in Guangzhou, southern China's Guangdong province


Beatriz Haddad Maia of Brazil hits a return against Richel Hogenkamp of the Netherlands during their women's singles semi-final match at the WTA Korea Open tennis championships in Seoul


Jelena Ostapenko of Latvia hits a return against Luksika Kumkhum of Thailand during their women's singles semi-final match at the WTA Korea Open tennis championships in Seoul


Caroline Wozniacki of Denmark hits a return against Garbine Muguruza of Spain during their women's singles semi-final match