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Normal service for Serena

World No 1 Serena Williams beat Maria Sharapova for the 15th time in a row to reach the final of the Sony Open in Miami.

Williams saw off the fourth-seeded Russian 6-4 6-3 and now leads the career head-to-head 16-2, both Sharapova's wins coming back in 2004.

The American had to come from a break down in both sets, recovering from 4-1 behind in the first and 2-0 in the second.

She was helped by eight aces and broke Sharapova's serve on five occasions in total, aided by five double faults from the Russian.

"It wasn't easy," Williams told the WTA Tour's official website. "Obviously Maria plays really well, and she's done really well here, so I just decided I had to do a little better, stay focused and make more shots."

Williams is now through to her ninth final at the event, having won six of them.

"That's pretty awesome - I didn't even realise!" said Williams, who will play either world No 2 Li Na or 10th seed Dominika Cibulkova for the title.

"But I just love playing here in Miami. This is my home. I love you guys!"

Sharapova said: "Despite my results against her, I still look forward to playing against her because you learn so much from that type of level which she produces.

"You finish the match, and you know where you need to improve and the things that you need to work on."