  Let $\mathcal{M}_{0}^n$ be the class of closed, simply-connected,
non-negatively curved Riemannian manifolds admitting an isometric, effective,
isotropy-maximal torus action. We prove that if $M\in \mathcal{M}_{0}^n$, then
$M$ is equivariantly diffeomorphic to the free linear quotient by a torus of a
product of spheres of dimensions greater than or equal to three. As an
immediate consequence, we prove the Maximal Symmetry Rank Conjecture for all
$M\in \mathcal{M}_{0}^n$. Finally, we show the Maximal Symmetry Rank Conjecture
for simply-connected, non-negatively curved manifolds holds for dimensions less
than or equal to nine without assuming the torus action is almost
isotropy-maximal or isotropy-maximal.
