The Charleston Open lost its top seed, Aryna Sabalenka on Thursday in the pre-quarter-final. Amanda Anisimova, the 15th seed took down the former world no. 2, 3-6, 6-4, 6-3 in an hour and 53 minutes. Sabalenka hit 10 double faults across the match, twice as many as Anisimova’s.Both players struggled with their serves, Sabalenka dropped hers five times while Anisimova was only able to save two of the six break points she faced. In the quarter-finals, Anisimova will play fellow American, Coco Vandeweghe. Meanwhile, Vandeweghe came through a derby for the second straight round against the sixth seed, Jessica Pegula. Vandewegh …