Updated after the match: Serena Williams brushed aside her sister, Venus, in what was eventually a lopsided match. Number 1 seed Serena beat 16th seed won 6-4, 6-3. The crowd was in Venus' corner but Serena never gave them a chance to get involved in the match. The match was done and dusted in just 67 minutes. Serena will next play Victoria Azarenka in the quarterfinals.
After surviving a scare in the third-round, Serena Williams will now face her sister for the 26th time in their careers. Serena holds a 14-11 edge against her older sister Venus. Serena may have the winning edge but Venus won their most recent meeting in Montreal. Serena started well against Great Britain's Heather Watson and won the first set 6-2 but after losing the second, she went down 3-0 in the third.
Rallying back from the deficit, Serena did all she could to win the next four games. She was then down 5-4 but eventually overcame the final hurdle to win the set 7-5. In comparison, Venus won her match in considerably less time. She dispatched of Aleksandra Krunic in straight sets.
The match will take place this evening.
"She's in better form than I am," Serena said when talking of her older sister. Monday's match between the two will be the headline match and whenever they meet, entertainment is delivered.
Fun facts: Both Venus and Serena have five Wimbledon titles each. They last met in the 2009 Wimbledon final, which Serena won in straight sets. This is the earliest meeting in any regular tournament since the 2005 US Open.
Fact file: Williams sisters
Of the two sisters, Venus, born in 1980, is one year older than her sister, Serena. The rivalry between the sisters was taken to a high when they met in eight Grand Slam finals between 2001 US Open and the 2009 Wimbledon tournaments. The two watch each other's matches in support even after one of them has been knocked out of the same tournament. Both players have four Olympic gold medals each to their name - one each in singles and three in doubles for America. The two compete together in doubles, winning 21 titles in total.
Fun facts: After the French Open in 2002, Venus and Serena were ranked No. 1 and No. 2 in the world respectively. During the French Open eight years later, they shared the No. 1 position in women's doubles. Venus holds 46 singles titles and Serena has 65 to her name.