Member of the ground staff prepare the court ahead of play on day three of the WTA Aegon Open on June 8, 2016 in Nottingham, England.

Caroline Wozniacki of Denmark during her women's singles match against Anett Kontaveit of Estoniaon day three of the WTA Aegon Open on June 8, 2016 in Nottingham, England.

Caroline Wozniacki of Denmark walks off after her women's singles match against Anett Kontaveit of Estoniaon day three of the WTA Aegon Open on June 8, 2016 in Nottingham, England.

Caroline Wozniacki of Denmark serves the ball during her women's singles match against Anett Kontaveit of Estoniaon day three of the WTA Aegon Open on June 8, 2016 in Nottingham, England.

Anett Kontaveit of Estonia in action during her women's singles match against Caroline Wozniacki of Denmark on day three of the WTA Aegon Open on June 8, 2016 in Nottingham, England.

Anett Kontaveit of Estonia in action during her women's singles match against Caroline Wozniacki of Denmark on day three of the WTA Aegon Open on June 8, 2016 in Nottingham, England.

Anett Kontaveit of Estonia in action during her women's singles match against Caroline Wozniacki of Denmark on day three of the WTA Aegon Open on June 8, 2016 in Nottingham, England.

Anett Kontaveit of Estonia in action during her women's singles match against Caroline Wozniacki of Denmark on day three of the WTA Aegon Open on June 8, 2016 in Nottingham, England.

Anett Kontaveit of Estonia celebrates during her women's singles match against Caroline Wozniacki of Denmark on day three of the WTA Aegon Open on June 8, 2016 in Nottingham, England.