Abstract. The WSMO-MX matchmaker applies different matching filters to retrieve WSMO-oriented service descriptions that are semantically relevant to a given query with respect to seven degrees of hybrid matching. These degrees are recursively computed by aggregated valuations of ontology based type matching, logical constraint and relation matching, and syntactic similarity as well. In this paper, we provide preliminary results of our experimental evaluation of the performance of WSMO-MX. In summary, it turned out that hybrid matching of WSMLMX services performs reasonably well.