Instant Replay
Computer-assisted video tracking technology has improved to the point that it can determine the position of a ball at impact with a margin of error less than five millimeters. Accordingly, starting with the NASDAQ-100 Open in March 2006, most top-level tournaments allow systems such as Hawk-Eye to be used to settle disputed line calls.
Players are allowed to appeal to Hawk-Eye on disputed calls with a limitation: They lose the privilege if the appeal goes against them three times per set, with one more challenge allowed during a tie-breaker.
In the 2006 NASDAQ-100 Open, challenges by men were upheld 38% compared to 27% for women (skewed by Maria Sharapova, who went 0 for 11).
At the Championships, Wimbledon 2008, in the mens singles challenges were successful 29% of the time with an average of 6.6 challenges per match, in the women singles challenges were successful 20% of the time with an average of 3.8 challenges per match.
Read more about this topic: Point (tennis)
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