Movement

An opponent might distract you by moving or standing in your field of view. This could be purely accidental or one of those deliberate old chestnuts.

When used as gamesmanship this can be particularly off-putting. As with noise distraction, the fact you notice might suggest you are not fully focussed. Do not try to ignore it and do not to let it get to you. Expecting your opponent to move each time you play would clearly indicate your attention is focussed more on your opponent than your task, so make sure they are out of view before you start in order to concentrate fully.

If it becomes a problem, ask your opponent to move to a position outside your field of view prior to commencing your pre-shot routine. If distracted during the performance of a shot, STOP. Speak politely with the offender and then re-start your pre-shot routine from the top. Hopefully, your opponent will get fed up with the additional time you need to spend over your shot and learn to stand still.