Melbourne, Jan. 26 : Controversy surfaced at the Australian Open here on Sunday when tennis player Tomas Berdych questioned the accuracy of the Hawk-Eye electronic line-calling system at a vital stage of his quarter-final match against defending champion Roger Federer.
The system which simulates ball flight to determine close calls was unable to offer an opinion on a line call, leading to an angry Berdych questioning the chair umpire over the apparent failure of the system to show a simulation of a ball called out early in the fourth set, reports The Australian.