2018 WTA Qatar Open: Catherine Bellis beats Karolina Pliskova at single's third round match

Catherine Bellis of the U.S. serves during the single's third round match against Karolina Pliskova of the Czech Republic at the 2018 WTA Qatar Open in Doha, Qatar, on Feb. 15, 2018. Catherine Bellis won 2-0. (Xinhua/Nikku)