He's back on top.

Faster than you can say, "Have a nice day and I hope to see you soon" 10 times at a normal pace, Jamaica's Usain Bolt reclaimed his 100-meter Olympic title on Sunday.

With a burst of speed over the final 40 meters, "Lightning Bolt" zoomed to the finish line in breathtaking fashion, clocking an exhilarating 9.63 seconds, the second-fastest time in history, to defend his Olympic title.