Maria Sharapova caused a mini-storm yesterday, albeit in a tea cup, when she claimed she had never met Scotland's most famous sporting mother, Judy Murray.

The Russian was responding after Judy had sent a Tweet comparing Sharapova to a tea bag - "put her in hot water and you'll find out how strong she is".

"Who's that?" Sharapova said. "Sorry. I didn't know who Judy Murray is."

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It can be hard to know sometimes with Sharapova whether she's joking but on the court she was all business as she recovered to beat Garbine Muguruza, the conqueror of Serena Williams, 1-6, 7-5, 6-1 to reach the semi-finals.

"I didn't do much in the first set to hurt her," Sharapova said. "But I also knew that the match wasn't over. Little by little, I started playing a bit better, getting into the court a little bit more, playing a little bit more aggressive."

In the semi-finals, Sharapova will play Eugenie Bouchard, the Canadian who matches her for tenacity and drive.

Bouchard dragged herself back from 4-1 down in the final set to beat Carla Suarez Navarro of Spain 7-6, 2-6, 7-5 and reach her second straight grand slam semi-final.

"We're in the semis of a grand slam so I'm going to respect her but not put her too high on a pedestal and really just battle," Bouchard said. "That's what it's going to be."

In today's remaining last-eight ties, the 2009 champion Svetlana Kuznetsova of Russia plays fourth seed Simona Halep of Romania and the 2012 runner-up Sara Errani takes on Germany's Andrea Petkovic.