  In this paper, we construct the moduli space of marked oper structures on a
closed, oriented smooth surface of negative Euler characteristic as a
holomorphic fiber bundle over Teichm\"{u}ller space. We prove that the holonomy
map from the space of marked oper structures to the moduli space of reductive
flat bundles is a holomorphic immersion, generalizing the known results for the
moduli space of marked complex projective structures. Finally, we prove that
the symplectic structure on the moduli space of marked complex projective
structures extends to a pre-symplectic structure on the moduli space of marked
opers whose reduced phase space is the space of marked complex projective
structures.
