David Dougherty is the former CEO of Convergys Corp., where he worked for 20 years. Now he’s launching a tennis apparel company even as he competes on the USTA Pro Circuit in the Men’s 60-65 division. Ninetyeight6 Performance Tennis Apparel is designed to keep athletes from overheating in the middle of a match. There’s a mineral embedded into the fiber of the material which helps regulate your body temperature.