CINCINNATI, OH, USA – Simona Halep recovered from a slow start to defeat Agnieszka Radwanska in Friday evening’s rain-affected quarterfinal of the Western & Southern Open.

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The latest intervention from the Cincinnati weather pushed the start of the match back by almost one hour, and when they did make it on court Halep appeared to have left her best tennis in the changing room. Radwanska could barely believe her luck as a string of errors enabled her to spring into a 4-0 lead.

But as the contest wore on Halep quickly began to resemble the player that has so impressed for much of this summer, outplaying the WTA’s master craftswoman to complete a 7-5, 6-1 victory.

“You have to change the rhythm. I didn’t hit as strong as I did first four games and I didn’t miss as I did at the beginning,” Halep said. “She was playing really well at the beginning, those four games, but then I had just to change, to play more angles, and then I came back and I think I was the one that was dominating match.”

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Halep has now won 13 straight matches on tour, and her confidence was clear for all to see under the lights of the Lindner Family Tennis Center. By the end of the first set she was even coming out on top in the games of tactical cat and mouse, drawing Radwanska into the net then spearing a winning passing shot to edge 6-5 ahead. She continued to impress both tactically and mentally the following game, recovering from 0-30 down to earn a set point, completing the turnaround with the type of cerebral touch her opponent would have been proud of.

This appeared to break the Pole’s will, Halep reeling off the final five games of the match to extend an unbeaten sequence stretching back to the Wimbledon quarterfinals. On that day it was Angelique Kerber that toppled the Romanian and the pair – who also locked horns in Montréal – will resume their rivalry in Saturday’s semifinals.

According to Halep, the outcome of the contest will hinge on the mental side of her game as much as the physical: “I have to slow down my emotions, because with her you feel that you can go for the balls, like to be aggressive, but it’s not that easy.

“So I have to be patient. I have to play my game like I did today. I think it’s pretty similar with the match, today’s match. I have to fight. I know that I can win. I have this confidence. I know that she’s a great player. I have nothing to lose. I’m going just to do my job and to try to win.”