Originally Posted by martini1
This should rarely happen because it is the one who is nearest to the ball to make the call. If the partner calls it out immediately I'd say 99% of the time he saw it better than you...
This is fallacious thinking and is a very common misconception. The person closest to the ball very often does not have the best view of the ball with respect to the line. If a player is very close
to the bounce point, their ability to make an accurate call on a ball on the line or close to the line is very poor.
The problem in this situation is that the player in question is usually trying to track the ball rather than focusing on the line. Certified linesman are taught not to watch the ball when it approaches close to a line of interest. If it appears that a ball will bounce close to a line, they stop watching the ball and focus on the line instead -- keeping their head & eyes very still before and after the bounce event.
This is not the case with the player who is trying to to return a ball. They are tracking the ball and their head and/or eyes are usually moving. Studies have shown that our ability to make an accurate ball when the head/eyes are moving is extremely poor.
In addition, even when the head/eyes are still, the ball is usually traversing the field of vision much too quickly when it is in close proximity for the smooth pursuit
(visual) system to track accurately. Quite often, the ball essentially becomes "invisible" for a short period of time when it is in close proximity. How often do you really seen the ball as it comes into contact with your strings? It is impossible most of the time. This is a similar situation for balls that bounce very close to us.