London: Agnieszka Radwanska enjoyed a remarkable turnaround in fortunes as she made her wealth of grasscourt experience count to dispatch American hope Madison Keys and reach the Wimbledon semi-finals for the third time in four years.

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Six weeks after perishing in the first round of the French Open to Germany`s Annika Beck, Poland`s finest stands two wins away from becoming the first player from her country to claim a Wimbledon singles title following a 7-6(3) 3-6 6-3 victory.

"After that match in Paris, I wouldn`t expect being in the semi-final here, that`s for sure," said a beaming Radwanska, who had suffered a wretched season before finding her feet on grass.

The 2012 runner-up, who at 13 is the highest seed left in the bottom half of the draw, needed six set points to seal the first set while the second slipped away after a bouncing net cord handed her 20-year-old rival a break in the eighth game.

Keys, one of three Americans to reach the women`s quarter-finals along with world number one Serena Williams and Coco Vandeweghe, produced a 106mph thunderbolt to draw level.

That was one of 12 aces she fired down on Tuesday which prompted John McEnroe to observe: "That serve of hers is such a big weapon. It can save her".

However, being the tournament`s leading ace lady -- with a total of 59 -- could not carry her over the finishing line.

Radwanska inched closer to victory by breaking in the eighth game of the decider and finished Keys off with a forehand.

She will meet Garbine Muguruza in Thursday`s semi-final.