The Williams sisters are set to face each other in another grand slam event, as both posted third-round victories on Friday at the U.S. Open. Serena Williams, the eighth seed, upended No. 25 seed Francesca Schiavone of Italy, 6-3, 6-4. Tenth-seeded Venus Williams breezed by 20th-seeded Daniela Hantuchova of the Slovak Republic, 6-3, 6-3. Also Friday, top-seeded Russian Maria Sharapova posted a 6-2, 6-4 victory over Julia Schruff of Germany. Fourth-seeded Kim Clijsters of Belgium also moved into the round of 16 with a 6-1, 6-4 pasting of 30th-seeded Japanese Ai Sugiyama. Venus has won 10 of the 18 all-time meetings against her younger sister. However, Serena captured six straight matches in the series before Venus won in straight sets in the quarterfinals of an event in Miami earlier this year. This will also be the third meeting between the sisters at the U.S. Open with the other encounters coming in the final. Venus won in 2001, while Serena captured the title the following year by defeating her sister. The two were in line to meet in the fourth round at Wimbledon this year, but Serena lost in the third round to Jill Craybas and then was hampered for the next several weeks with an ankle problem. This will be the ninth time the Williams sisters will battle in a grand slam event. Serena has won five of the eight previous matches. "It's going to be a lot of hard hitting, a lot of hard serving. We'll both have a few tricks up our sleeves," Venus said after her win over Hantuchova. Venus, 25, the 2005 Wimbledon champion, has won the U.S. Open twice (2000-01) and moved to 8-0 all-time against Hantuchova. Venus broke serve in the first game of the match and won the final three games of the first set before taking the opening three contests of the second to post the routine win Serena, 23, a two-time winner (1999, 2002) of the Open, took advantage of six double faults by her opponent on Friday. It was also sweet revenge for Serena, the 2005 Australian Open champion, as she lost to Schiavone on the clay courts of Rome earlier this year. Sharapova, who held the No. 1 ranking for only seven days last week before giving it back to Lindsay Davenport, notched a triumph in 63 minutes over Schruff, who was experiencing problems with her left thigh. This marks the deepest Sharapova, the 2004 Wimbledon champ, has advanced at the U.S. Open. "I felt pretty good. It's good to get three matches in before the tough ones come," Sharapova said. "So far, so good." Sharapova's next opponent will be India's Sania Mirza, who recorded a 7-6 (7-4), 6-4 win over Frenchwoman Marion Bartoli. Mirza is the first woman from her native country to reach the round of 16 in a grand slam event. Clijsters, a four-time runner-up at grand slam events, beat Sugiyama for a fourth straight time. Clijsters, who lost to Justin Henin-Hardenne in the 2003 U.S. Open final, will next face Maria Vento-Kabchi of Venezuela. Vento-Kabchi upended Shahar Peer of Israel, 7-5, 4-6, 6-3 for her best result thus far in her ninth U.S. Open. Also Friday, ninth-seeded Nadia Petrova of Russia defeated American Laura Granville, 6-2, 7-5. Petrova will next face Czech Nicole Vaidisova, who posted a 6-1, 7-6 (7-2) victory over Ivana Lisjak of Croatia.