India, March 13 -- Zheng Qinwen courted controversy during her fourth round win against Marta Kostyuk at the Indian Wells Open, on Wednesday. During the warm-up before the match began, Kostyuk was hitting volleys, but suddenly had to stop as her Chinese opponent refused to continue, despite time being left on the clock.

Kostyuk seemed psychologically rattled by the moment and could only react in utter confusion. The Ukrainian ended up losing the match, 3-6 2-6.

The incident happened with one minute and 40 seconds left on the warm-up clock, and then suddenly Qinwen was sending lob shots to her opponent, so she could get some volley practice. Then suddenly, Qinwen decided to stop it and wanted to start serving.

Kostyuk, who was confused ...