Prime seed Jessica Pegula booked her spot within the WTA 500 Charleston Open semifinals following a hard-fought win over fellow American Danielle Collins on Friday.
The world quantity 4 needed to combat from a set all the way down to oust the defending champion and event seventh seed 1-6, 6-3, 6-0, and can subsequent face Russian Ekaterina Alexandrova for a spot within the last.
Alexandrova, seeded ninth, noticed off third seed Qinwen Zheng of China 6-1, 6-4.
