ISBN: | 978-5-5138-7818-6 |
High Quality Content by WIKIPEDIA articles! The Cincinnati Open is an annual outdoor hardcourts tennis event held in the Cincinnati suburb of Mason, Ohio, USA. The event started on September 18, 1899 and is the oldest tennis tournament in the United States played in its original city., Between 1978 to 1989 it was a major tournament of the men`s Grand Prix Tennis Tour and part of the Grand Prix Championship Series.