jim8flog
Journeyman Pro
I always thought that a player had to play with his own equipment, not that of a PP or fellow competitor. Hence, John Daly walking off the course and not borrowing one off Craig Parry.
These are the specific Rules for Pros
Clubs and the Ball.
List of Conforming Golf Balls - Model Local Rule G-3 is in effect.
e. One Ball Rule - Model Local Rule G-4 is in effect, except for an amateur playing in a Pro-Am portion only of the official competition.
A pro can get a ball off a pro he is playing with provided it is the same make and model.