Serena and Venus Williams both reach fourth round

Finished with a mostly matter-of-fact victory in the U.S. Open's third round Friday, defending champion Serena Williams switched into a yellow T-shirt with this bit of wisdom in blue script:''Can't spell dynasty without nasty.''About the only thing Williams doesn't need to sell anyone on is the quality of her tennis, particularly at Grand Slam tournaments.
By beating serve-and-volleying Spaniard Maria Jose Martinez Sanchez 6-3, 7-5, Williams improved to 28-1 over the past five majors.
No. 3 Venus Williams, the 2000-01 Open champion, got past 46th-ranked Magdalena Rybarikova of Slovakia 6-2, 7-5. Next up for the elder Williams: a fourth-round match against Kim Clijsters, who recently came out of retirement and is playing in the tournament for the first time since winning it in 2005."She was a great champion," Venus Williams said."She still is".