NEW YORK — No need for any extra practice for Serena Williams after this performance.
Plus, it's not as if she needs to study too hard to figure out how to deal with her next opponent.
Playing far better than she did earlier in the U.S. Open as she chases a calendar-year Grand Slam, Williams set up a quarterfinal against older sister Venus with a 6-3, 6-3 victory over 19th-seeded Madison Keys on Sunday.
"A Williams will be in the semis, so that's good," the No. 1-seeded Serena said after needing only 68 minutes to dismiss Keys, a 20-year-old American with formidable serves and forehands who simply was outplayed.