I think that is a testament to how good the 2015 ProVs are and how well Jimmy was playing.

Same here.  My handicap is higher than yours and I was also fortunate enough to test this past year.  I didn't have them very long.  I found they don't float and when they hit trees at high speed they don't magically bounce back in the fairway.

I was fortunate to test the prototype this summer.  It is a very durable ball. If you miss all the trees and don't hit a cart path you could easily get 2 rounds out of a ball.  I don't hit anyway near as hard as JW does but I used 1 for 3 rounds, it was showing signs of wear by then though.

Never been superstitious and blamed a miss put or bogey on the ball that is  just the results of the human holding the clubs.LOL Unless I lose a ball or hit it into a tree,or put it into the water.I will keep playing the same ball. After using my balls for awhile I will rotate them into shag bag for practice.

I read in another article a while back that Jordan Spieth will keep the same ball in play so long as he's playing good. I think it was after he won the Australian Open. Not sure how many balls he used for the whole tournament though.

I found only using 1 ball per round very interesting as well.  Usually within 9 holes, I have scuffed/marked the ball during wedge shots so I put a new ball in rotation at the turn and save the scuffed balls for practice.  The way Jordan spins the ball, I would think he would have a similar experience.  However, if it isn't broken, don't fix it.

As long as it isn't lost OB, I always try to play one ball for the round.  I've tried to change balls mid-round to jump start my round, but the same hands/arms/body are on the other end of the club.

That's my goal from the first tee on unless it suffered major damage from hitting a cart path or tree or something else....  I'll admit, it's a good feeling walking off 18 knowing you didn't lose a ball....  But would it make up for my poor score?? nah......

Not the balls fault if I make a bad shot, titleist balls are the best out there. I've played 2-3 rounds with the same ball keeping the ball in the short grass greatly extends its life

Following my round yesterday, I finally trashed my Pro V1 after four and a half rounds.  I only did this because the printing was about 50% gone and the ball (a 2013 edition, with custom number and personalized) was looking really grubby.  Today was a totally different story--three brand-new balls lost in two holes, with a fourth (and the last of that group of the personalized, custom number balls) gone three holes later, in the water.  Guess it all evens out in the end.