Using an ocean general circulation model forced by daily mean winds derived from the NCEP/NCAR reanalysis, we examined possible roles of the tropical Indian Ocean in the Asian summer monsoon-ENSO coupling. A dominant precursory signal of anomalous monsoon circulation relevant to ENSO is the presence of latitudinally asymmetric anomalies of tropical convection and SST about the equator in the preceding spring. The model results show that the equatorial asymmetry of surface latent heat flux plays a vital role in generating that of SST in the preceding spring, implying that a positive wind-evaporation-SST (WES) feedback proposed by Xie and Philander is crucially responsible for generation and maintenance of those equatorial asymmetries. Associated with anomalous Walker circulation in response to ENSO, anomalous convection is indicated off the equator over the warm pool region of the western North Pacific in the preceding winter, thereby exciting equatorially asymmetric atmospheric Rossby waves. The westward propagation of convection-induced waves can trigger a WES mode in the tropical Indian Ocean. Persistence of the WES feedback regime affects land-surface hydrologic processes in the Asian continent through a Rossby wave response to anomalous convective heating. It is anticipated that the WES mode in the tropical Indian Ocean serves as a bridge between the ENSO prevailing in the preceding winter and anomalous summer monsoon.