Top seed Jessica Pegula once again fought back from a set down to reach the WTA Charleston Open semi-finals with a 3-6, 6-3, 6-2 win against Russia's Diana Shnaider on Friday.On the other side of the draw, fifth-seeded American Madison Keys booked her semi-final spot with a 4-6, 6-3, 6-2 victory over third-seeded Swiss Belinda Bencic in a battle of former Charleston champions.
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