Results from CDF and D0 collaborations on the inclusive jet cross
sections at 1800 and 630 GeV and strong coupling constant are presented.  The
statistical uncertainties are significantly reduced relative to the previous
results and experimental systematic uncertainties are comparable with the
uncertainties in the theoretical predictions.  Despite observed discrepancies
with theory, which could be accommodated by modifications of parton
distribution functions, the inclusive jet cross sections can be described by
perturbative Quantum Chromodynamics.