The 2012 London Olympics are set to kick off July 27, with some new (and old) athletes looking to make their mark on history.
Since 1896, there have been hundreds of athletes who have made their marks and endeared themselves to millions of fans around the world.
Some overcame tremendous odds to win a gold medal, while others were so good that they won a lot of medals during their career.
Here's a look at 30 of those athletes who I consider to be the greatest in Summer Olympics history.
Note: Over the course of more than 100 years of Olympics and tens of thousands of athletes, undoubtedly there will be some that are missed or forgotten about. Still, these 30 athletes are in my opinion some of the greatest ever.