  By recognizing the tremendous flexibility of the emerging fluid antenna
system (FAS), which allows dynamic reconfigurability of the location of the
antenna within a given space, this paper investigates the performance of a
single-antenna FAS over spatially correlated Nakagami-$m$ fading channels.
Specifically, simple and highly accurate closed-form approximations for the
cumulative density function of the FAS channel and the outage probability of
the proposed system are obtained by employing a novel asymptotic matching
method, which is an improved version of the well-known moment matching. With
this method, the outage probability can be computed {simply} without incurring
complex multi-fold integrals, thus requiring negligible computational effort.
Finally, the accuracy of the proposed approximations is validated, and it is
shown that the FAS can meet or even exceed the performance attained by the
conventional maximal ratio combining (MRC) technique.
