Simona Halep shocked after early exit from US Open (photo credit: Getty Images)

World number one Simona Halep has suffered a shocking first-round exit from the US Open by losing 6-2 6-4 to Kaia Kanepi on Monday.

Halep becomes the first number one seed to lose in the first round at the US Open in the Open era.

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And when the Estonian world number 44 was asked what was the secret to her win over Halep, she responded: “I stayed aggressive all the time.”