  Is the mechanism of unconventional superconductivity in Sr$_2$RuO$_4$ closer
in spirit to superfluid $^3$He, or to the cuprates, pnictides, and organic
superconductors? We challenge prevailing assumptions in this field and using
well-controlled perturbative renormalization group calculations, we suggest
that superconductivity in Sr$_2$RuO$_4$ resembles more closely the quasi-one
dimensional organic superconductors. Our theory has certain phenomenological
consequences that are consistent with the experimentally observed phenomena.
