The final singles match of today’s Family Circle Cup produced the biggest upset of the tournament.

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World No. 113 Bethanie Mattek-Sands blasted World 16 Sloane Stephens 6-2, 6-0 on the Billie Jean King Court.

Stephens is the highest seed in the to tournament to fall. She was the No. 4 seed and lasted just one match.

It marked the first time Mattek-Sands defeated the 20-year-old Stephens. Stephens defeated Mattek Sands two times last year: once in Rome and once at Roland Garros. Both victories came on red clay.

Mattek-Sands is playing in her sixth tournament in Charleston