  We study the renormalization group(RG) evolution of four-quark operators that
contribute to the top pair production. In particular, we focus on the cases in
which certain observables are \emph{first} induced from the one-loop RG while
being absent at tree-level. From the operator mixing pattern, we classify all
such RG-induced phenomena and underlying models that can induce them. We then
calculate the full one-loop QCD RG evolution as the leading estimator of the
effects and address the question of which RG-induced phenomena have largest and
observable effects. The answer is related to the color structure of QCD. The
studied topics include the RG-induction of top asymmetries, polarizations and
polarization mixings as well as issues arising at this order. The RG-induction
of top asymmetries is further compared with the generation of asymmetries from
QCD and QED at one-loop order. We finally discuss the validity of using the RG
as the proxy of one-loop effects on the top pair production. As an aside, we
clarify the often-studied relations between top pair observables.
