Surprisingly, players challenged calls from the other side of the court an equal amount, and both players and linesman were less accurate calling balls on the baseline and service line than on the sidelines or center line. Players who challenged less weren’t found to be more or less accurate than their counterparts, so don’t go home with a challenge in your pocket. Hawk-Eye is a camera-based system that got its start in cricket. For the past two years it’s received rave reviews from even the harshest pundits (cf. McEnroe). Using triangulation methods, Hawk-Eye claims an accuracy of 3.6 millimeters when taking into account a variety of potential adverse conditions. The company was in the midst of developing a system for soccer when FIFA suddenly pulled the plug.
