Andrea Petkovic of Germany serves during the women's singles first round match against Jelena Ostapenko of Latvia at the 2018 US Open tennis championships in New York, the United States, Aug. 28, 2018. Jelena Ostapenko won 2-1. (Xinhua/Wang Ying)
Jelena Ostapenko of Latvia hits a return during the women's singles first round match against Andrea Petkovic of Germany at the 2018 US Open tennis championships in New York, the United States, Aug. 28, 2018.