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桑普拉斯（从古至左）1．向上抛球。2．身体在右侧是一平面。3．重·O放在前脚，左腰部向前突出。4．向上伸直身体。5．身体向前的同时击球。6．用力转腕。7．一步跨入场内。格拉夫（从右三左）1．用手掌轻握球。2．双手上举向上抛球。3．重心移至前脚。4．左手有力地放下。5．
Sampras (from the oldest to the left) 1. Throw the ball up 2. The body is a plane on the right. 3. Heavy · O on the front foot, left waist prominent forward. 4. Straighten up. 5. The body hit the ball forward at the same time. 6. Forced to wrist. 7. Step into the venue. Graff (from right third left) 1. Hold the ball lightly with your palm. 2. Raise the ball with both hands on the move. 3. Move the focus to the front foot. 4. Left hand strong down. 5.