Venus still holds the worlds' fastest maindraw WTA Tour serve record at 130 miles per hour and routinely serves at an average of 115 miles per hour at Wimbledon. By comparison, five time Wimbledon champion Roger Federer of Switzerland serves at an average of 117 miles per hour at Wimbledon.
And despite trailing Serena 10 to 7 in total singles grand slams won, Venus leads Serena in total Wimbledon singles titles five (2000, 2001, 2005, 2007, 2008) to two (2002, 2003).
Friday night (7:00 AM PST USA) at the Barclays Dubai Tennis Championships semifinals, the Williams sisters meet for the 19th time with the series tied 9-9 with Venus winning their last meeting 5-7, 6-1, 6-0 in November.
Since the beginning of their tennis careers, both players have played similar aggressive baseline games, but Serena's more dependable forehand and second serve have perhaps won her a greater percentage of matches.
Serena was injured in their November meeting. But in their US Open quarterfinal, which was won by Serena 7-6(8-6), 7-6(9-7), Venus led in both sets before Serena raised the level of her game while Venus' game faltered.
At the Wimbledon final, Venus won 7-5, 6-4 by playing short aggressive points and serving into Serena's body.
Serena, currently ranked number one, has more patience than Venus, currently number six, on the tennis court and is better at adding topspin to her groundstrokes to stay in more points. This is why I think unless Venus can take control early in the majority of points and in the match overall, Serena will win. The winner of the first set between the sisters has won 16 of their 18 matches.