  We report the latest results on the top-quark mass and on the top-antitop
mass difference from the CDF and D0 collaborations using data collected at the
Fermilab Tevatron $p\bar{p}$ collider at $\sqrt{s}=1.96$ TeV. We discuss
general issues in top-quark mass measurements and present new results from
direct measurements and from top-pair production cross-section. We also report
new results on the top-antitop mass difference.
