  In the minimal supersymmetric Standard Model, the heaviest CP-even Higgs
boson H and the CP-odd Higgs scalar A are predicted to be almost degenerate in
mass at the tree level, for the wide kinematic range M_A > 2M_Z and \tan\beta
\ge 2. However, if large soft-CP-violating Yukawa interactions involving scalar
quarks of the third generation are present in the theory, then the CP
invariance of the Higgs potential can be maximally broken beyond the Born
approximation, and the high degree of mass degeneracy between H and A may be
lifted through a sizeable HA mixing. After taking the CP-odd tadpole
renormalization of the A boson into account, we find that the small mass
difference M_H - M_A, which is about 1% of the A-boson mass at the tree level,
can be substantially enhanced to the 25% level at the one-loop order. We also
find that the loop-induced mixing between the lightest CP-even Higgs boson h
and the A boson may be of comparable size to M_h. We briefly discuss the main
phenomenological implications of the predicted hA and HA mixings for the
general Higgs-boson mass spectrum and for CP-violating observables at collider
and lower energies.
