US Open 2015: Serena Williams to meet sister Venus in quarter-finals

Serena Williams saw off a significant threat to her Grand Slam hopes with victory over 19th seed Madison Keys at the US Open. 

Williams, the world number one, beat her fellow American 6-3 6-3 to set up a quarter-final against her sister Venus.

Serena Williams, 33, is now three wins from competing the first calendar Grand Slam since Steffi Graf in 1988.

The next player in her path is 35-year-old Venus Williams, who beat Estonia's Annett Kontaveit 6-2 6-1.



Men's defending champion Marin Cilic and 19th seed Jo-Wilfried Tsonga both progressed and will meet in the quarter-finals.

Top seed Novak Djokovic plays 24th seed Roberto Bautista Agut later on Monday.

 

 

Champion Cilic rolls on

 

Marin Cilic beat Kei Nishikori in the final of the 2014 US Open 

Cilic survived an examination from France's Jeremy Chardy, and a twisted ankle, to return to the quarter-finals.

After winning the first set, the Croat rolled his ankle in losing the second and was taken to a third-set tie-break.

But he took that with the help of four aces and breezed through the fourth to complete a 6-3 2-6 7-6 (7-2) 6-0 win.

"Jeremy played really well from second set on and I was having trouble with my movement after twisting my ankle," said Cilic, a first-time Grand Slam winner at Flushing Meadows last year.

The ninth seed will next play Tsonga, who beat fellow Frenchman Benoit Paire 6-4 6-3 6-4.