  Preliminary results of ttbar cross section measurements and single top
exclusion limits of the Tevatron experiments CDF and D0 are presented. The
different measurements are based on a dataset between 140 and 200 inverse pb
corresponding to a data taking period from spring 2002 to September 2003. The
ttbar cross section measurements are consistent with each other and the
Standard Model prediction. Data and Monte-Carlo prediction are in good
agreement in the search for single top quark. Its observation is anticipated
with roughly 2 inverse fb integrated luminosity.
