CHARLESTON, S.C. (AP) — U.S. Open champion Sloane Stephens has withdrawn from the Volvo Car Open, citing mental and physical exhaustion after her run to the Miami Open title this past Saturday.

Stephens was seeded fourth in the season's first clay-court event. She pulled out of the tournament Monday.

Stephens said in a statement she was sorry to miss the event, but her championship play in Miami "left me completely exhausted/fatigued both physically and mentally."

Stephens defeated Jelena Ostapenko 7-6 (5), 6-1 to win the Miami tournament this past weekend.

Stephens said she did not feel ready to play her best tennis and decided it was in her best interested to get some rest.

Stephens, the 25-year-old American, won her first major at the U.S. Open last September.

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