The methodology of CDF and D0 top quark analyzes and their underlying assumptions are summarized. The CDF and D0 top mass averages, obtained from measurements in several channels and based on about 100 pb^-1 of data from p\bar p collisions at \sqrt {s} = 1.8 TeV collected by each experiment in Run I, are: M_t=176.1\pm 4.0 (stat) \pm 5.1 (syst) GeV/c² and M_t=172.1\pm 5.2 (stat) \pm 4.9 (syst) GeV/c², respectively. The combined Tevatron measurement of the top quark mass is M_t= 174.3 \pm 3.2 (stat) \pm 4.0 (syst) GeV/c². The CDF measurement of the  t \bar t cross section (assuming M_t=175 GeV/c²) is \sigma _tt=6.5 \pm ^1.6_1.4 pb, and the D0 value (assuming M_t=172.1 GeV/c²) is \sigma _tt=5.9\pm 1.7 pb. In anticipation of much larger statistics, prospects for top physics in Tevatron Run II are summarized. The fact that top quark analyzes are among the best windows to physics beyond the Standard Model is emphasized.

PACS numbers: 13.85.Ni