Vicky Duval trailed 3 - 0 30 - 0 in the third set against qualifier Ana Sofia Sanchez of Mexico .
Vicky Duval won the final six games of the match for a 4 - 6 , 6 - 1 , 6 - 3 victory .
Vicky Duval trailed 3 - 0 30 - 0 in the third set against qualifier Ana Sofia Sanchez of Mexico , but won the final six games of the match for a 4 - 6 , 6 - 1 , 6 - 3 victory .