I picked up a pair of these at our local running store where I have shopped with my Cross Country running daughter. I was just going to use them for cross training when I mentioned to salesperson that I play tennis. She said these may be good for tennis. I played in them the next day and haven't turned back. They are great for tennis. I used to have sore feet after playing in, you name it, Nike, New Balance and Babolat tennis-specific shoes. Not with my ON's! The only problem is that they leave a mark on the clay courts where the wedge/valley runs the length of the shoe sole. Maybe ON can design a tennis specific shoe. I think they would sell.