CHARLESTON : Madison Keys overcame some uncharacteristically poor serving and elevated her game late on to edge fellow American Sloane Stephens 7-6(6) 4-6 6-2 and advance to the semi-finals of the Charleston Open on Friday. Both players struggled with their serves in a match that included 13 breaks but it was Keys who was able to cut down on the errors and step up the intensity in the third set, which she won when Stephens sent a backhand long. The match on the green clay also featured a seesaw first set tie-breaker in which Keys jumped out to a 4-0 lead before Stephens stormed back with six straight points.

Stephens failed to convert either of the two set points she had on her serve and Keys unleashed a blistering cross court forehand winner to capture the hour-long first set. “It’s always tough to play a friend and it kind of shows at times like that,” Keys said of the wild first set tie-breaker. “It was up and it was down and it was just kind of crazy.”

The win was a first for Keys over Stephens, who came out on top in their semi-final match up at last year’s French Open and in the 2017 U.S. Open final. Next up for Keys is Puerto Rican Monica Puig, who crushed 29 winners to topple American Danielle Collins in their quarter-final to end the day.