Potapova appeared to be heading toward a decider with Viktorija Golubic but then saved four break points and won in two sets.
No. 5 seed Katerina Siniakova came from a break down in the third set to defeat Caroline Dolehide in the Transylvania Open second round.
Explore Europe's largest underground amusement park, a subterranean world that looks like it belongs in a sci-fi movie!
Day 4 at the WTA event in Cluj-Napoca will see the conclusion of the Round of 16, with several intriguing matchups in ...
N.C. A&T at Charleston (CBSSN); 7 p.m. — Temple at South Florida (ESPN2); 7 p.m. — Marist at Fairfield (ESPNU); 7 p.m. — Maryland at Ohio St. (FS1); 8 p.m. — Louisiana Tech at Liberty (CBSSN); 9 p.m.