  This paper reports the most recent measurements of single top quark
production performed by CDF and D0 collaborations in proton-antiproton
collisions at Tevatron. Events are selected in the lepton+jets final state by
CDF and D0 and in the missing transverse energy plus jets final state by CDF.
The small single top signal in s-channel, t-channel and inclusive s+t channel
is separated from the large background by using different multivariate
techniques. We also present the most recent results on extraction of the CKM
matrix element $|V_{tb}|$ from the single top quark cross section.
