  Preliminary results of two differential cross-section measurements in the
ATLAS experiment at CERN are presented. Measurements are focused on the
top-antitop quark pair production in the~lepton+jets and the~all-hadronic
channels in the kinematic region with high transverse momentum top quarks. Both
measurements use the full Run 2 data of 13 TeV proton-proton collisions from
the Large Hadron Collider collected by the ATLAS detector in 2015-2018,
corresponding to an integrated luminosity of 139 fb$^{-1}$. The measured
spectra are compared with the Standard Model predictions. They are also used to
set limits on the Wilson coefficients of an effective field theory extension of
the Standard Model.
