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As a swiss citizen, is it possible to join the lower German Leagues?Not just in the US but in any part of the world. It is normal to come into the Bundesliga in a lower division and play your way up on merit while learning the league into a higher division. And between being a foreign national (limited spots for players who are not EU citizens) and performance pressures, there are lots of world class players in the lower divisions.
It is borderline delusional not to be a world class star and expect to debut in divisions 1. Even the German top talents do debut in division one, they play their way up because they start the lower leagues at a younger age.
Even in the lower leagues, there are sometimes opportunities to play the top league or for the top league to have a player need to get some reps in a lower division. If you are serious about TT and sure to perform, it is a good place to develop skill. Again, there are lots of players who played at an extremely high level (top 100 WR or 2700‐2800 USATT) who never did better than division 2 in German league. It is extremely competitive.