We present recent preliminary measurements of the top-antitop
pair production cross section and determinations of the top quark pole mass,
performed using the data collected by the CDF and D0 Collaborations at the
Tevatron Collider(1).  In the lepton plus jets final state, with
semileptonic B decay, the pair production cross section has not been
measured at CDF using ~760 pb-1 of proton-antiproton collisions at a
centre-of-mass energy of s**(1/2) = 1.96 TeV.  A measurement of the production
cross section has also been made with ~1 fb-1 of data in the all-jets final
state by the CDF Collaboration.  The mass of the top quark has now been
measured using ~1 fb-1 of collision data using all decay channels of the
top quark pair, yielding the most precise measurements of the top mass to
date.