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The catcher changed his catching position to the left. The pitcher's ball tended to go to the right side.

About the part in bold, is your default understanding of it on the pitcher's right hand or the left hand?
Comments  
Neither. It is a conundrum.
You mean without any further context you cannot tell which?
Students: Are you brave enough to let our tutors analyse your pronunciation?
Yes, I am confused in trying to figure out which way the pitcher and catcher are viewing themselves and the other.
So it's confusing to native speakers. No wonder it's confusing to me. Actually, what I have here is this:

He was frustrated at how inaccurate his son's pitching control was, so he changed his catching position to the left because his son's ball tended to go to the right side.
It still leaves me nonplussed. Maybe we need to know more about curve balls, knuckle balls and sinkers.
Students: We have free audio pronunciation exercises.
OK. THanks, MM.