US Open 2013: Serena Williams & Victoria Azarenka reach final

Defending champion Serena Williams will face second seed Victoria Azarenka in a rematch of 2012's US Open final after they swept through their semi-finals.

Belarusian Azarenka beat Italy's Flavia Pennetta 6-4 6-2 on Arthur Ashe Stadium in a match with 13 breaks of serve.

Williams, the 31-year-old world number one, then needed seven match points before sealing a convincing 6-0 6-3 win in the second semi-final.

The American has dropped just 16 games in six matches at this year's event.

"It was a good match," said Williams. "Li Na is such a great player. I got a little nervous but I was able to close it out, finally."