Maria Sharapova takes on Angieszka Radwanska in the round robin stage of the WTA Championships in Istanbul today at 1:00 p.m. ET.

Russia's Maria Sharapova recorded a 6-3 6-2 victory over Italy's Sara Errani in a repeat of the French Open final.

"It was a slow start - I gave Sara a lot of time, and that's what she likes," Sharapova, who won 10 of the last 12 games, said.

"Her variety is what has won her so many matches this year. She loves to open the angles. I think the points were going a bit too long - I just tried to step in and be more aggressive after that, and it really helped me."

Meanwhile, Sharapova's competitor Radwanska defeated defending champion Petra Kvitova on Monday by overcoming the Czech in straight sets, 6-3 6-2.

"I'm just very happy about my performance," the world No. 4 said in her on-court interview.

"The first match is always tough and adjusting to a new surface is never easy, but I was playing really well from the beginning to the end of the match.

"I am just happy that I could play my best tennis today and close that match in two sets. It's a good start."

Watch Maria Sharapova vs. Angieszka Radwanska live stream, click here.

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