In 1979 the tournament moved to Mason where a permanent stadium was built and the surface was changed from Har-Tru clay to hardcourt (DecoTurf II.). Later, two other permanent stadia were constructed, making the Cincinnati Masters the only tennis tournament outside the four Grand Slam events with three stadium courts – Center Court, Grandstand Court and Court 3. A new Court 3 was built in 2010, increasing the number of stadium courts to four, with the existing Court 3 renamed Court 9. The women's competition was reinstated in 1988 for one year, and then again in 2004 when the organizers, with the help of the Octagon sports agency, bought the Croatian Bol Ladies Open and moved it to Cincinnati.