Azarenka did what many believed was impossible by outcompeting Serena Williams in the tie breaker during the second set at the Women's Final of the U.S. Open 2013 on Sunday afternoon. The game's score as of the time of writing this story is Williams 7-5, Azarenka 7-6, Williams 2-1.

WATCH LIVE STREAM AT THE USOPEN.ORG OFFICIAL SITE

Williams, the number one, defeated number two Azarenka during the first set 7-5 but she had to fight at the end of the second set to win back her balance as Azarenka defeated her 7-6. By the end of the second set, Williams looked angry at herself as Azarenka hit the returns back and capitalized her game.

Williams is the defending champion. If the 31-year-old tennis star wins today, this would be her fifth U.S. Open title and her 17th career grand slam singles crown.

Azarenka, 24, won two Australian Open singles titles in 2012 and 2013 becoming the first Belarusian player to win a Grand Slam in singles.

The two players who are known to be friends, have openly spoken about becoming completely opponents on the court.

"We completely get along, and once the match is on we are completely opponents," said Williams, according to Reuters. "That's what it's about.

"We leave everything on the court, play as hard as we can, almost as if we've never met each other in our lives."

Azarenka said Williams brings out the best in her.

"She's obviously an amazing player. She's the greatest of all time," said the 24-year-old Belarussian, according to Reuters.

"When you play against Serena, you have to play your best because she makes me play my best.

"I think I kind of do the same way to her. I think we kind of raise each other's level all the time and take each other to the limit - to go out of that place where you sometimes don't know how far you can go, but you just still go for it," she added.