The selective wetting behavior of filler (silica or CNTs) in emulsion styrene butadiene rubber (ESBR)/solution styrene butadiene rubber (SSBR) blends was characterized by the wetting concept, which was further developed for filled blends from miscible rubbers. The nanopore structure of the silica surface has been recognized as the main reason for the difference in the wetting behavior of the branched ESBR molecules and linear SSBR molecules. However, the effect of nanopore structure becomes more significant in the presence of silane. It was discussed that the adsorption of silane on silica surface constricts the nanopore to some extent that hinders effectively the space filling of the nanopores by the branched ESBR molecules but not by the linear SSBR molecules. As a result, in silanized ESBR/SSBR blends the dominant wetting of silica surface by the tightly bonded layer of SSBR molecules causes a low energy dissipation in the rubber-filler interphase, that imparts the blends the low rolling resistance similar to silica filled SSBR compound, while the ESBR-rich matrix warrants the good tensile behavior, i.e. good abrasion and wear resistance of the blends. The results of CNT filled ESBR/SSBR blends with ionic liquid as coupling agent were taken into consideration in order to compare with those of silica/silane filled ESBR/SSBR blends.