Jerzy really has issue with his serving. It is obstacle.
He threws ball so height, maybe wind affects it. But I am not really sure.
I believe there are issues for his serving.
Jerzy regulary serves 180km+ second serve.
But I remember John McEnroe talking about Djokovic's second serve when he was commentary druing 2nd round of Wimbledon 2008, Safin vs Djokovic match.
It's in, people called it brilliant. But if it is not....