I now removed all the savegames (Made a backup in a different folder).
Now I made a game with Nadal in Slot A, and the top 3 consists of Djoko, Fed and Murray.
I saved the game, then started a new game with Djokovic in slot B (or any other slot) where the top 3 is Murray, Nadal and Fed. Saved that game also in slot B.
Whenever I load the slot A with Nadal game, Djokovic has again disappeared from the top 3 and is now ranked #70 being aged 16 again. How is this possible after the update?