The Ultimate Fighting Championship (UFC) is one of the fastest-growing sports entertainment businesses in the world. If you don’t know what the UFC is, then it’s time for you to move out from under that wrestling ring and take up residence under the octagon. The UFC started as an open-class competition free-for-all with no rules, in which competitors beat one another to a pulp, and the sport has evolved into the mega fighting industry it is today.

Here are 10 UFC fighters who have helped the sport grow into what is today. Some fighters have helped more than others, but all have made some contribution to the business. These 10 UFC fighters are the best fighters to enter the Ultimate Fighting Championship ring.

10. Dan Severn

9. Georges St. Pierre

8. Anderson Silva

7. Tito Ortiz

6. Chuck Liddell

5. B.J. Penn

4. Matt Hughes

3. Ken Shamrock

2. Royce Gracie

1. Randy Couture

To read the rest of this story in it's entirety with more explanation behind each pick, click here.