"I was awful in the first half of the race, so I had to work a little bit harder to win. It's all about determination, because I want to be the best, and I want to stay on top... I don't pick one person out and say 'he will be hard to beat' because you never know who will pop up" -Usain Bolt, in a nice article on Bolt and the current level of sprinting.
What makes this QOTD material, though, is the fact that Bolt is still driven to get better even though his world records in the 100 and 200m are seemingly untouchable and he hasnt been beaten in almost 2 years.
And, just in case you missed the race: