American teenager Louisa Chirico showed her maiden WTA Tour main-draw win was no fluke, defeating former world number 11 Alize Cornet.
Louisa Chirico continued her dream week at the Citi Open, the American wildcard upsetting world number 28 Alize Cornet on Wednesday.
Chirico, who brought up her maiden WTA Tour main-draw win two days earlier, earned a thrilling victory over fifth seed Cornet 7-5 4-6 7-6 (7-4) in just over three hours.
The 19-year-old thrice coughed up a one-break lead in the deciding set, but took control of the tie-break by winning both points on Cornet's serve when the score was 4-3 in the American's favour.
Chirico's breakout tournament at the WTA International hard-court event will see her next take on either Sloane Stephens or fourth seed Svetlana Kuznetsova in the quarter-finals.
Second seed Sam Stosur was not distracted by her first-round feat, accounting for Irina Falconi 6-1 7-5.
Stosur had brought up win number 500 of her professional career in her Washington opener, and managed to get through in straight sets despite Falconi serving for a decider at 5-3 in the second set.
Irina-Camelia Begu, the sixth seed, struggled past Polona Hercog 3-6 7-5 6-4.
Monica Niculescu ended the hopes of Lauren Davis, who joined fellow American Falconi in an early exit after a 1-6 6-1 6-4 defeat.
Niculescu will face Stosur for a spot in the semi-finals.