Originally Posted by movdqa
I agree about a deficiency on their team. If it's a problem with too much sweat building up on his socks, then he should get better technology here or even change socks at the changeover.
As far as why Djokovic doesn't have blister problems, perhaps he doesn't sweat as much. There are considerable variance in the amount that individuals sweat.
For my whole career in sports, which consists of tennis, baseball, basketball, football, and cross country. I have never gotten blisters on my feet. Novak could easily just have callouses or like you said, doesn't sweat as much.