Serena Williams Swings Towards Grand Slam

The tennis champion attempts to claim the fourth and final major title in the same season.
1:42 | 08/31/15

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Transcript for Serena Williams Swings Towards Grand Slam
Authorities will wait 72 hours before anyone is allowed back in the water. And the U.S. Open begins tomorrow. And tickets for the women's final are sold out faster than the men's final. Here's Mary Bruce. Reporter: Tonight, the unstoppable Serena Williams ready to claim the one prize that's managed to escape her. Reporter: The tennis superstar poised for what may be the most demanding feat in all of sports, the grand slam. Attempting to claim all four major titles in the same season. The pressure is tremendous, but Williams is playing it cool in an interview with ABC's robin Roberts. You're about to start the U.S. Open and you seem so chill. I mean sincerely. I'd rather be in the position where I have the pressure and I have people expecting me to win than be in a position where it's like, oh, well she probably won't win, she'll probably make a deep run. And that's not what I want and once I realized that I embraced it. Reporter: Steffi Graf scored the last grand slam in 1988. The 33-year-old powerhouse has already won the other three major titles this year, and the U.S. Open six times before. But lying in wait, the only two players who have managed to beat Williams this year, Belinda bencic and Petra kvitova. They could possibly derail her, but it's a long shot. Experts say it would be a complete shock if Williams doesn't slam the grand slam. Now, Williams has no clear rival here at the U.S. Open. This is hers to lose. The greatest competition here, is maybe herself.

This transcript has been automatically generated and may not be 100% accurate.

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