Madison Keys has talked openly about the debilitating effects pressure can have on elite athletes but the American said she finds a way to harness that tension at the Grand Slams, after the 17th seed moved into the U.S. Open semi-finals on Wednesday. Keys spoke last year about a "dark pit of despair" she found herself in after her career stalled due to the pressure of trying to stay in the upper echelons of the sport.
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