I love these posts.
The Russian guy's forehand and Coria's serve going AWOL out of nowhere is scary to read, especially for a pro that makes a living out of this. Muscle memory is a funny thing; from personal experience as a former club level player when I broke my humerus bone and was out of action for 6 months, I couldn't rediscover my backhand even to this day, 8 years later. Tried everything like watching a ton of Nalbandian and Safin videos
nothing worked. Still can't hit a damn backhand to save my life.
But if you can lose a shot without even giving a break, that's scary as hell.