Danielle Collins extended her winning streak to 10 matches, winning twice on Thursday to reach the quarterfinals of the Credit One Charleston (S.C.) Open.

First, Collins upset second-seeded Ons Jabeur of Tunisia 6-3, 1-6, 6-3 in a second-round match that had been pushed back to Thursday due to rain. Then Collins blitzed Sloane Stephens 6-2, 6-2 in a matchup of unseeded U.S. players.