  The top quark pair production cross-section ${\sigma}_{t\bar{t}}$ has been
measured in $p\bar{p}$ collisions at center of mass energies of 1.96 TeV using
Tevatron Run 2 data. In the begining of Run 2 both CDF and D\O\
$\sigma_{t\bar{t}}$ measurements in the {\it dilepton} channel
$t\bar{t}{\to}WbW\bar{b}{\to}\bar{\ell}{\nu}_{\ell}b{\ell}^{'}\
bar{\nu}_{{\ell}^{'}}\bar{b}$ and in the {\it lepton plus jets} channel
$t\bar{t}{\to}WbW\bar{b}{\to}q\bar{q}^{'}b{\ell}\bar{\nu}_{\ell
}\bar{b}+\bar{\ell}{\nu}_{\ell}bq\bar{q}^{'}\bar{b}$ agree with the NLO
(Next-to-Leading-Order) theoretical predictions. The presence of a top signal
in Tevatron data has been reestablished.
