  We show in single top quark production that the spin of the top quark is
correlated with the direction of the d-type quark in the event. For single top
production in the W* channel, the d-type quark comes dominantly from the
antiproton at the Tevatron, whereas for the W-gluon fusion channel the
spectator jet is the d-type quark the majority of the time at this machine. Our
results are that 98% of the top quarks from the W* process have their spins in
the antiproton direction, and 96% of the top quarks in the W-gluon fusion
process have their spins in the spectator jet direction. We also compare with
the more traditional, but less effective, helicity basis. The direction of the
top quark spin is reflected in angular correlations in its decay products.
