When it comes to serving, Serena is the best in the game. When it comes to serve speed, she has to take a back seat to sister Venus. Serena is #2 (thus far for 2010) clocking a serve at 128 mph while Venus is #1 with a (2010) serve speed of 128.6 mph (both serves recorded at the French Open).
When it comes to the All-Time Serve Speed Record, Serena is yet again #2 (128mph at the 2010 French Open) and Venus is #1 (129mph at the 2007 U.S. Open). These sisters are quite familiar with being #1 and #2. This week Serena is ranked #1 in Singles and #1 in Doubles. Venus is ranked #2 in Singles and #1 in Doubles (w/ Serena).