The fourth round came to a close on Day 8 of the 2010 Australian Open. Both Serena and Venus Williams progressed, as well as Chinese Li Na and Belorussian Victoria Azarenka.

Top seed Serena Williams routinely defeated home favorite Samantha Stosur 6-4 6-2 in the fourth round. The impressive performance by the American saw her lose only seven points on serve throughout the match, including one double-fault in the second set.

Serena’s opponent in the quarterfinals will be seventh-seeded Victoria Azarenka who won the day’s final match, coming back from a set down to beat Russian Vera Zvonareva 4-6 6-4 6-0 in almost two and a half hours.

Venus Williams had more trouble advancing to the quarterfinals than her sister Serena. The sixth seed lost the first set and was a break down in the second before recovering for a 3-6 6-2 6-1 victory against Italian Francesca Schiavone.

Next for Venus will be seed No.16 Li Na of China who upset fourth seed Caroline Wozniacki 6-4 6-3 to join countrywoman Zheng Jie in the last eight, thus making history for China – it is the first time two Chinese players are in the quarterfinals of a Grand Slam event. Li Na and Venus Williams have had only one career meeting, at the 2008 Beijing Olympics, and the winner was Li.

Other quarterfinal pairs include Justine Henin vs. Nadia Petrova and Zheng Jie vs. Maria Kirilenko. (photo via Australian Open)

Here’s a bit of light talk away from the Australian Open. Nike has released new Nike Women Rock Victorious films featuring Maria Sharapova and Serena Williams. The films celebrate personal moments of victory and the dedication to training, and both players reveal what they consider their greatest wins. Just guess, they cited the same tournament!

Defending champion Serena Williams beat Carla Suarez Navarro 6-0 6-3 to advance to the fourth round of the Australian Open. Let me remind you that the Spaniard knocked out Serena’s elder sister Venus at last year’s Australian Open, in the second round already. This year, the top-seeded Serena avenged her sister’s defeat, won the first five games of the match in just 15 minutes, then the long sixth game in 19 minutes, before routinely taking the second set.

Venus Williams took out home favorite Casey Dellacqua 6-1 7-6(4) in the third round. The sixth-seeded Williams was pushed to play a second-set tiebreak, and her opponent even fought off three match points before finally losing to the seven-time Grand Slam champion.

Serena will next meet Australian 13th seed Samantha Stosur, and Venus will play seed No.17 Francesca Schiavone of Italy. (photo via Australian Open)

I came across this funny interview with Serena’s and Venus’s mother Oracene Price, who talks about how she’s had enough of the tennis life and its repetitiveness. She really opened up to the reporter and even revealed why she wears sunglasses at tennis matches (I’m sure you can already guess the reason).

Top seed Serena Williams lost just three games to advance to the second round of the Australian Open, the tournament she won last year in both singles and doubles. The four-time Australian Open champion defeated Poland's world No.72 Urszula Radwanska 6-2 6-1 and will next play Petra Kvitova of the Czech Republic.

Serena’s sister Venus beat Czech Lucie Safarova 6-2 6-2 to advance to the second round. The sixth-seeded Williams will try to improve on her last year’s result, when she was upset in the second round by Carla Suarez Navarro. Venus' opponent in the next round will be Austrian Sybille Bammer.

The sisters will again team up for the doubles competition. (photo: Getty Images)