Golf ball comprising a single layer core formed from a substantially homogenous formulation and comprising: geometric center and outer surface; inner core region disposed about the geometric center, outer core region adjacent the outer surface, and intermediate core region disposed between the inner and outer core regions and extending radially from about 10 mm to about 16 mm from the geometric center. A first hardness is disposed within the inner core region, a second hardness is disposed within the outer core region, and a third hardness of from about 40 Shore C to about 95 Shore C (or about 30 Shore D to about 70 Shore D) is disposed within the intermediate core region and is greater than each of the first and second hardnesses. At least one hardness in the outer core region is substantially the same as or less than a hardness in the inner core region.