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| | Balls Stick, Shoes Slide: Serving Up the Physics of Tennis Courts |
 | | After winning the Australian Open on hard courts, and French Open on clay courts, Capriati lost on the grass of Wimbledon in the semi-finals. |
 | | Now a physics professor at the University of Sydney is looking into some of the peculiar properties of clay tennis courts - which may explain why players like Capriati are able to triumph on clay courts, but may stumble on grass. |
 | | "On a fast grass court, they serve as fast as possible; on clay, they drop the serve speed in order to put more spin on the ball." The result is a fast, low bounce on grass, which is hard to return, and on clay a slower, higher bounce, which is also hard to return. |
| www.aip.org /isns/reports/2001/027.html (352 words) |
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