The सिनसिनाटी मास्टर्स is an annual tennis event held in the सिनसिनाटी suburb of मेसन , ओहायो , अमेरिका . The event started on September 18 , 1899 and is today the oldest tennis tournament in the United States played in its original city.
Entity: ओहायो — Type: /location/province, /location/county, /location