The Cincinnati Masters (currently sponsored by the Western & Southern Financial Group and called the Western & Southern Open) is an annual outdoor hardcourt tennis event held in Mason near Cincinnati, Ohio, USA. The event started on September 18, 1899 and is the oldest tennis tournament in the United States played in its original city.
The tournament is the second largest summer tennis event in the U.S. after the U.S. Open, as its men's portion is one of nine elite Masters 1000 tournaments on the ATP World Tour and its women's event is one of five Premier 5 events on the WTA Tour.
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