Simona Halep moved a step closer to the world No 1 ranking after easing into the quarter-finals of the Western & Southern Open with victory over Anastasija Sevastova.
Grigor Dimitrov reached the Western & Southern Open quarter-finals with a comfortable straight sets victory over Juan Martin del Potro in Cincinnati.
Victoria Azarenka may miss the US Open later this month because of a disagreement with her former partner over the care of their baby son.
Venus Williams and Angelique Kerber both suffered early exits in the women's event at the Western & Southern Open in Cincinnati.
Rafael Nadal is through to the third round in Cincinnati after extending his spotless record against Richard Gasquet.
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