The combined heat and mass transfer during the evaporation of a superheated spherical droplet subject to an external flow field composed of its own saturated vapor, when the droplet and its surrounding vapor contain a tracer amount of a volatile transferred species, is numerically modeled. The droplet mass transfer model is an extension of the Kronig and Brink method to variable droplet radius. Gas-side heat and mass transfer are treated using the quasi-steady him theory. Calculated parameteric results, demonstrating the effects of important parameters when the partition coefficient of the transferred species is much larger than one, are presented.