the strauss conjecture for the minkowski spacetime in three dimensions states that the semilinear equation \[ \box u = |u|^p, \quad u(0)=\epsilon f, \quad \partial_t u(0)=\epsilon g \] has a global solution for all $f$ and $g$ smooth, compactly supported and $\epsilon$ small enough if $p > 1+\sqrt 2$. we prove a similar result in the context on schwarzschild and kerr with small angular momentum spacetimes. this is joint work with h. lindblad, j. metcalfe, c. sogge, and c. wang