  We reconstruct B0bar -> D_s^-D^+ decays using a sample of 275 million BBbar
pairs recorded by the Belle experiment, and we measure the branching fraction
to be [7.42 +- 0.23(stat) +- 1.36(syst)] x 10^(-3). We also search for the
related decay B0bar -> D_s^+D_s^-. We observe no statistically significant
signal and set an upper limit on the branching fraction of 2.0 x 10^(-4) at 90%
C.L.
