Serena Williams Aims for Grand Slam at US Open

2:20 | 08/30/15

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Transcript for Serena Williams Aims for Grand Slam at US Open
All right let's turn now to Sara who has an upset on tennis. They gave me tennis. Serena is hoping to make more history, going for the calendar grand slam, no one has won all four major tournaments in the same year in nearly 30 years. ABC's Mary Bruce is in flushing meadows where the U.S. Open gets started tomorrow. Good morning, Mary. Reporter: Good morning, Sara. It all comes down to this -- Serena Williams has had a banner year, 48 wins, right here this week, she'll try to pull off the most difficult achievement in all of sports. This morning, the queen of tennis is appearing to play for the ultimate crown. Next step is New York. Reporter: An achievement not achieved in 30 years. The pressure so thick Serena can slice it with her famous serve. The Williams playing it cool win an interview with our robin Roberts. How do you keep it all together. Actually it's easy. I don't feel pressure to win here. I want to win here more than anyone. But at the same time, I don't feel that pressure. I felt a lot of pressure in wimbledon going for the Serena slam, getting that four in a row, that was interesting. Reporter: This year, she's already won the Australian open the French open and the nail-biter at wimbledon. Serena Williams, the wimbledon champion for the fifth time. Reporter: This week, taking on the U.S. Open, she's won it six times before, including each of the last three years. Williams, now, thriving not just to win but to also be grand. Now, this is her salute, Serena Williams has no clear rival here at the U.S. Open and even she's acknowledged the only thing standing between her and history is herself. Tom and Paula. Good point, many people say she's the greatest. ESPN will be the exclusive home for the 2015 U.S. Open, coverage of the two-week tournament begins today.

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

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