| ESPN.com: Sports Business | [Print without images] |
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| Serena and Venus Williams have been dominating both on and off the tennis court. |
| Sharing the market | ||
| Company | Market share | |
| Nike | 17.8 percent | |
| Reebok | 12.3 percent | |
| New Balance | 7.9 percent | |
| Adidas | 7.7 percent | |
| Source: National Sporting Goods Association | ||