Pros change putters all the time. Many are just like us, always looking for something that may improve the scores.
Apparently that was a **bleep** good change for him! Hopefully it's not just a honeymoon phase and he keeps up that incredible strokes-gained-putting performance.
@DonJ I don't think he will be playing next month he keeps staying in the top 10 he'll keep earning his way into the next tour stop. But either way he is a future star an that is a really cool hat I will go an see the other players there if he is bonus but if he's not good for him. I'll be rooting for him going forward seems like Callaway has some nice young players on their list.