41 Organization of tennis tournaments in the nature of promulgating, maintaining, and enforcing rules and standards for facilities regarding their use for tennis tournaments and tennis-related events; mathematical sports rating services, namely, calculating the relative ability and performance of tennis players by assigning numeric measure; entertainment in the nature of tennis tournaments and tennis-related events; providing information on the sport of tennis via the Internet; providing online web sites containing tennis information of interest to professional tennis players, tennis tournament directors, tennis media, tennis coaches, other tennis personnel, and tennis fans and spectators; sanction, certification, coordination, scheduling, and approval of tennis tournaments; providing on-line tennis newsletters; organization of tennis tournaments in the nature of setting standards and rules for tennis tournaments; providing online non-downloadable magazines in the field of tennis; providing online non-downloadable directory publications in the field of tennis associations; providing online non-downloadable electronic publications in the nature of rule, reference and guidebooks in the field of tennis; providing online non-downloadable electronic publications in the nature of program brochures in the field of tennis; providing online non-downloadable electronic publications in the nature of statistical books in the field of sports league players