Top-quark physics plays an important role at hadron colliders such as the
Tevatron at Fermilab or the LHC at CERN. Given the planned precision at these
colliders, precise theoretical predictions are required. In this paper we
present the complete electroweak corrections to QCD-induced top-quark pair
production in quark--antiquark annihilation. In particular we provide compact
analytic expressions for the differential partonic cross section, which will be
useful for further theoretical investigations