The term PR means Protected Ranking, whereby an injured player is only ranked for two months of the term of an injury, and the ranking is used over the period in which he returns to play. This ranking is used for tournament entry purposes.
Protected ranking.
pr
PR is a grading system used for proof coins
personal record
You probably mean "Lawn" tennis. Lawn tennis is simply tennis played on a grass court.
A zero score in tennis.
tennis courts
tennis
pr in medical terms stands for "per rectum," or a drug inserted into the rectum.
person reporting
that you are 100% puerto rican
It's basically rankings in Tennis.