Single top production provides opportunities for studying the
charged-current weak interaction of the top quark.  The tt-bar invariant mass
spectrum M_tt-bar enables the search for non-standard model tt-bar resonance
states.  These two topics have motivated new developments in top quark related
analyses at Fermilab Tevatron.  This presentation reports the current single
top and M_tt-bar analysis methods and the corresponding results from the
collider Run I data collected by the CDF and D0 experiment.  We conclude with
the prospects of these studies in the upcoming collider Run II.