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Carina Witthoeft of Germany serves during the single's second round match against Caroline Wozniaki of Denmark at the 2018 WTA Qatar Open in Doha, Qatar, on Feb. 14, 2018. Caroline Wozniaki won 2-0. (Xinhua/Nikku)
Carina Witthoeft of Germany serves during the single's second round match against Caroline Wozniaki of Denmark at the 2018 WTA Qatar Open in Doha, Qatar, on Feb. 14, 2018. Caroline Wozniaki won 2-0. (Xinhua/Nikku)