space T∗ M, strictly convex and superlinear in the momentum variables, we prove
uniqueness of certain “ergodic” invariant Lagrangian graphs within a given homology or
cohomology class. In particular, in the context of quasi-integrable Hamiltonian systems, our
result implies global uniqueness of Lagrangian KAM tori with rotation vector ρ. This result
extends generically to the C0-closure of KAM tori.