Sinner has always been compared naively or more simply incompetently to Berdych, when in reality the current Berdych for characteristics is more identifiable precisely in Fritz.
Both equipped with a very incisive serve and very solid fundamentals from the baseline and with a very aggressive game, but both who also have their weak point in the movement obviously calibrated to the elite level.
The answer to the thread is almost too banal, to date indisputably Berdych, but this does not take away the fact that between the two there are actually several similarities in terms of characteristics and styles of play.