Kim Clijsters Photos: Picture Gallery of Strokes

Clijsters demonstrates an outstanding point of contact for a power first serve. Kim's leg drive initiates the kinetic chain that generates her power, and it has lifted her off the ground, raising her point of contact. Her arm is fully extended, and she's leaning in just enough to benefit from her weight moving forward without losing height of contact or having to worry about the racquet starting to tilt downward. Kim doesn't appear to be seeing the ball get hit, but she drops her head much less than many other top players do.