A new process for production of carbon black/silica master batches with enhanced mechanical properties has been developed. The unit operations in the process are the preparation of filler dispersion, in presence of suitable surfactant, addition of the dispersion to the fresh natural rubber latex under stirring, coagulation of the mixture by the addition of acid, dewatering of the coagulum, and drying to obtain filler incorporated NR. Mixed filler containing master batch prepared by the new process showed good cure characteristics as compared to the dry rubber incorporated mix. The mechanical properties like tensile strength, modulus, tear strength, abrasion resistance and hardness were superior for the vulcanizates prepared by the new method. The heat build-up values were considerably low for the latex filler master batches. Comparatively better ageing resistance was also recorded by these vulcanizates. The improvement in mechanical properties shown by the silica/carbon black master batches over the conventional mill mixed compounds was attributed to better filler dispersion evidenced from the result of filler dispersion data.