Samantha Stosur (STOE sir) (click on link for official site)
She is a powerful Australian doubles specialist who decided a few years ago to really start working on her singles game. Since then she has become Australia's great hope for another singles champion. She is a great all court player who really knows how to construct points using her serve and forehand. She is dangerous for any player to come up against.
Samantha is well known for her kick (topspin) serve. She doesn't hit it with a lot of pace, but she has a lot of action on it. Action is a term that means that the ball does something once it hits the ground. In this case, Samantha's kicker jumps very high in the air (especially on clay). Usually she hits this kick serve to the backhand of a right-handed player. The player TRIES to get the ball crosscourt to Stosur's backhand. But Stosur has usually set up for the big forehand.
What makes the serve nice is that Samantha has a serve and volley serve. She keeps her elbow up as she hits through the ball with a relaxed motion.
It is the same principle behind her big forehand. It is relaxed and has a whiplike motion. She also hits it with a western grip (the same grip Rafael Nadal uses to hit his topspin forehand). As you can see in this slowmo video, Sam's arm and wrist accelerate the racket through the ball at the last moment. It allows her to hit angles and deep shots so she can REALLY run her opponents around. Variety is the spice of life!
The biggest problem in her game is that she gets really fragile at the end of tournaments. Sam definitely has the talent to be number one in the world. She has certainly beaten the best. But for some reason she gets fragile towards the end of big tournaments. She could blow through the firsts rounds on to the finals and then starts to play horribly.