  We present a calculation of heavy-flavor production in hadronic collisions in
association with one jet matched to parton shower Monte Carlo programs at
next-to-leading order in perturbative QCD. Top-quark decays are included and
spin correlations in the decay products are taken into account. The calculation
builds on existing results for the radiative corrections to heavy-quark plus
one jet production and uses the POWHEG BOX for the interface to the parton
shower programs PYTHIA or HERWIG. A broad phenomenological study for the Large
Hadron Collider and the Tevatron is presented. In particular we study---as one
important sample application---the impact of the parton shower on the top-quark
charge asymmetry.
