In the Crystal Mark Laws at Law 42.2.2, it states:
“The marker must make sure that the jack is at least 21 metres from the mat line after it has been centred.”
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The same words are used in the Officiating Manual for Markers, Measurers & National Umpires for training. The Zone 10 COP 2016 at point 15.3 states:
"The marker should ensure that the delivered jack is the required distance from the mat line after it has been centred. If there is any doubt, the marker may call an umpire to determine if the jack has been improperly delivered."
With Singles events being played in due course it is important that there is a clear understanding of what is required.
Provided by Don Couch
WPH Chairman of Umpires