Hawk-Eye’s ball-tracking technology is used at all the slams and Masters-level tournaments, with the exception of those contested on clay courts. The theory is that the ball leaves a mark when it bounces on clay, allowing the umpire to climb down from his or her chair and adjudicate on contested decisions. But the system is hardly foolproof.
Sometimes it is a matter of interpretation whether the little oval of displaced clay is touching the line or not. And the new trend is for outraged players to seek photographic evidence. The best recent example came from the event in Rome earlier this month, where Viktor Troicki went through a four-minute meltdown over a line call. See video under Wimbledon 2013 Play Highlights http://youtu.be/165r4mM9edc
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