Danish teenaged tyro Clara Tauson took advantage of four double-faults from Ludmila Samsonova on Monday to post a 6-3, 6-3 defeat of the Russian for a second-round spot at the Charleston 2 tournament.
The event is part of a double bill in the southern city, laid on by the WTA to save some COVID travelling stress for players.
Tauson, the 2019 Australian Open junior champion, won her first Tour-level title in early March at Lyon.
The No. 101 is entering her second week on clay after losing in the Bogata first round six days ago.
Samsonova was broken twice in a straightforward contest lasting less than 90 minutes on the hybrid American green clay.
American Shelby Rogers scored an opening-day win, losing just one game against outclassed compatriot Caty McNally in a 62-minute rout.