Serena Williams Vs. Sloane Stephens Live Stream: US Open Tennis 2013 (WATCH)

Americans Serena Williams and Sloane Stephens meet on Sunday in the fourth round of the 2013 US Open. The match is scheduled for 4 p.m. ET. Watch the live stream HERE.

Williams continued to play some of her best tennis late Friday night when she defeated Yaroslava Shvedova in two sets (6-3, 6-1). In the quest for her fifth US Open title, Williams hasn't dropped one set during the tournament.

The reigning Roland Garros champion doesn't feel any pressure to win, believing any more titles in her storied career are just extra.

"That's the beauty of my career. I don't need to do anything at all," the 31-year-old American said earlier in the week, via Yahoo! Sports. "Everything I do from this day forward is bonus. Everything for me is just extra."

She faces Stephens, a fellow American. Stephens is ranked No. 16 in the World with a 29-18 record and no titles for the year. The 20-year-old is arguably playing the best tennis of her career. She's reached career-bests at all four Slams this year: the semifinals at the Australian Open, the fourth round at Roland Garros, the quarterfinals at Wimbledon and the fourth round at the US Open.

"It's going to be tough, Sloane is playing so well," Williams told the Guardian. "I'm always so happy for her. Regardless, there's definitely going to be one American in the quarters and I'm really excited about that and proud of Sloane. It will be a really good match."

Stephens defeated Mandy Minella in the opening round (4-6, 6-3, 7-6 (5)), then Urszula Radwanska (6-1, 6-1) and Jamie Hampton on Friday for a spot in the fourth round.

Sunday is only the third career meeting between Williams and Stephens. They've split their two previous matches, with Williams winning in 2013 at Brisbane and Stephens winning a few months later at the Australian Open.

*Stats via WTATennis.com and MatchStat.com.

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