The 2012 Olympic Games in London provided a lot of great memories and moments ranging from Usain Bolt's continued dominance to the curtain call for Michael Phelps.
The Olympic Games also provided medals in 302 different events. It is the gold medals that garner the most attention and turn athletes into legends. After all, nobody remembers the athlete with the most silver or bronze medals in any event. If they do, it's certainly not openly discussed.
The gold medal is the ultimate achievement in a sport on the world stage. It signifies that you or your team and country are the best in the world. Winning one gold medal is a hard enough feat, much less the thought of repeating four years later.
Here are some gold-medal winners that are most likely to achieve that difficult task.