The tournament was started in 1899 as the Cincinnati Open and was renamed in 1901 to Tri-State Tennis Tournament, a name it would keep until 1969 (it would later be known by several other names, including ATP Championships), and would eventually grow into the tournament now held in Mason. The original tournament was held at the Avondale Athletic Club, which sat on property that is now Xavier University, and would later be moved to several various locations due to changes in tournament management and surfaces. The first tournament in 1899 was played on clay courts (described in a newspaper article of the time as "crushed brick dust"), and the event was mostly played on clay until 1978 when it switched permanently to hardcourts.