Daria Kasatkina might have been in astonishing form as she swept past Angelique Kerber 6-0, 6-2 - but she knows she will have to maintain that kind of display if she is to make it to the final of the BNP Paribas Open.

The 20-year-old Russian takes on Venus Williams in Friday's semifinal, and said: "To win this one and go further, I have to really show my best tennis."

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