Amateur tennis players typically call their shots, but professional games traditionally have line umpires who make the call if or not a ball is "out" or "good." The chair umpire has the ability. This system led to players if they disagreed with the call, arguing with umpires. In 2008, rules for player challenges utilizing technology became uniform throughout tennis. The French Open does not utilize this challenge system, because the ball makes a mark on the clay surface of the court.

Use of Hawk-Eye Technology

The technology employs a system of cameras to monitor also the motion of the ball on that courtroom and the lines of a tennis court through time and space. That data is then converted by computers to a digital image that displays the trajectory of the ball using a shadow. The use of this technology has not put line umpires from a job. The call is made by line umpires, and the chair umpire consults Hawk-Eye if a player creates a challenge.

Number of Challenges Available

Technically, a player can challenge a line umpire's call as he wants. But he is only allowed to be wrong three times per pair or four if the set needs a game. For games with advantage collections, each player is allowed three challenges once the score is tied at six games. If play continues through 12 more games, the players are allowed another three challenges. In matches using a set, that place is treated just like any other new pair, with each player allowed three unsuccessful struggles. These allowances for challenges that are ineffective expire at the end of every set and can't be carried over into the following.

When Players Can Use Challenges

A player can make a challenge if play has ceased -- meaning the shooter as called ended the stage, or the player stopped playing the stage. He's permitted to return the ball but must quit playing then if he wishes to challenge the line Ufa umpire's judgment. If the player waits too long to challenge the line umpire's call, the chair umpire may deny his petition.

Results of the Challenge

If the chair umpire takes a player's request becomes his final decision and can't be appealed further. If the line umpire originally judged the shot to be helpful, but electronic review indicates the ball was outside, the point ends at the receiving player's favour. If the line umpire judged a shot when review shows it was great to be outside, the point would be replayed. The chair umpire does have the ability, but to score the stage in favor of the player who hit the ball, if in his judgment the shooter was impossible for another player to return.

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