Serena Williams shakes hands with Madison Keys after winning the all-American clash on Arthur Ashe.
Serena Williams shakes hands with Madison Keys after winning the all-American clash on Arthur Ashe.
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Venus Williams of the United States celebrates after defeating Anett Kontaveit of Estonia in their fourth round match.
Venus Williams of the United States celebrates after defeating Anett Kontaveit of Estonia in their fourth round match.
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Venus and Serena have won 28 grand slam singles titles between them and shared 13 grand slam doubles titles.
Venus and Serena have won 28 grand slam singles titles between them and shared 13 grand slam doubles titles.
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Serena leads the career head to head 15-11 with the most recent victory at Wimbledon in July.
Serena leads the career head to head 15-11 with the most recent victory at Wimbledon in July.
Streeter Lecka/Getty Images
Serena and Venus to meet in last eight

Story highlights

Williams sisters to meet in last eight of U.S. Open

Venus Williams beats Anett Kontaveit 6-2 6-1

Serena gets past Madison Keys 6-3 6-3

Eugenie Bouchard pulls out through injury

CNN  — 

It’s the quarterfinal match up that everyone was hoping for and Serena and Venus Williams duly delivered Sunday at Flushing Meadows.

First up on the Arthur Ashe Stadium Court, elder sister Venus wasted little time in beating 152nd-ranked Estonian teen qualifier Anett Kontaveit 6-2 6-1 in a one-sided encounter, taking less than an hour.

Later, top seed and grand slam seeking Serena dispatched fellow American and 19th seed Madison Keys, winning 6-3 6-3 with a single break of service in each set.

It kept her on course for the calendar grand slam, last achieved by Steffi Graf in 1988.

If she lifts the title Serena would also draw level with the German on 22 grand slam singles titles.

But first she must get past her sister Venus, who has found a new lease of life at 35, having not progressed so far in a grand slam since reaching the semifinals of the U.S Open in 2010.

exp open court tennis cnn serena venus williams role model_00002001
exp open court tennis cnn serena venus williams role model_00002001
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Related video Serena: Venus was a great role model

They will battle for a semifinal place Tuesday, with Serena leading 15-11 in career meetings, most recently winning in the fourth round on the way to the Wimbledon title in July.

But at the U.S. Open their four meetings have been shared, including the 2001 final won by Venus, one of her seven grand slam titles.

Both were full of praise for their respective sibling after their wins.

“I’m so proud of Serena and I think she’s proud of me. We inspire each other,” said Venus.

“She is playing great,” was Serena verdict on Venus. “I have to play like I did today or better. But at least one of us, a Williams, will be in the semis, so that’s good.”

Bouchard pulls out

Their match up will be eagerly awaited, but there was disappointment for the New York fans Sunday as Canada’s Eugenie Bouchard withdrew from the U.S. Open after failing to recovery from a head injury sustained in a freak locker room fall.

“Eugenie Bouchard is withdrawing from the women’s singles competition at the 2015 U.S. Open due to a concussion,” said a statement.

The 21-year-old had been due to face Italy’s Roberta Vinci for a spot in the last eight.

Read: Freak fall incapacitates Bouchard

Bouchard, returning to form after a dismal year, was also in the women’s doubles and mixed doubles but has also been forced to pull out of those competitions.

Cilic marches on

In the men’s singles, Marin Cilic continued his impressive defense of his title with a 6-3 2-6 7-6 6-1 win over France’s Jeremy Chardy, shrugging off an ankle injury as he dropped the second set.

It is the 11th straight win at Flushing Meadows for the ninth seeded Croat, firing four aces to win a pivotal third set tiebreaker.

He will next meet Frenchman Jo-Wilfried Tsonga as the Frenchman eased past compatriot Benoit Paire in straight sets to earn his place in the quarterfinals.