Serena Williams Beats Sister Venus In Quest for Grand Slam

The famed tennis players squared off in an intense quarterfinals match that went all three sets.
2:14 | 09/09/15

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Transcript for Serena Williams Beats Sister Venus In Quest for Grand Slam
Biggest match yet at the U.S. Open. Lara, I know you were hanging on every minute. It had it all, everyone. A sold out stadium. Celebrities galore. One sister competing against another for history so how would they react? All eyes on Serena and Venus in an electrified battle at the U.S. Open. The sold out crowd bu they Pu pt U aine on these electronic billboards so people can call see anything suspicious. Hopeful help. All right, thanks. With the other top nation's bstigge airlines. The CEO of united airlines and two osthere haves rdneig am aid growing corruption scandal accusedin ggiv preferential treatment to the port authority which operates in the New York at issue is whether united flew a dedicated nonstop route to South Carolina where the chairman had a vacation home so that the airline could win his support for airport improvements. That former chairman was also linked to the so-called bridgegatecandal in new Jersey. United says it is cooperating with the investigation. And in Europe as more refugees pour ino and the best person I know. Reporter: The little sister now just two matches away from becoming only the third woman in modern tennis to achieve a calendar grand slam. A feat last accomplished in 1988 by a then 19-year-old steffi Graf. When Serena was just 6 years old. But she knows whatever is in her future her biggest fan will be there, cheering for her all the way. I'll always be the older sister. That's never going to change. She's really the best ever. Got chills again. Yep. I just love that. And she always is there for Serena in that box cheering her on. And normally Serena doesn't show that type of emotion when playing Venus but she did last night so you know -- that's true. Testify if I graph, will she go? It would be so amazing if she is there if Serena makes it to the final. She still has another match but if she makes it to the final and testify if I graph is there, wow. That would be great. History in the making. Thank you very much. For more U.S. Open quarterfinals action coverage begins today at 11 A.M. Eastern on ESPN. And more coming up on "Gma."

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

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