Merritt, the 2007 world runner-up to Wariner, won in a lifetime best 43.75 seconds, a time only four runners in history have bettered.
Image: LaShawn Merritt of the United States poses with his gold medal on the podium after the men`s 400m final.
Text and Image: AFP (Any unauthorised reproduction is prohibited)
Vijender, the glamboy of Indian boxing | Day 12: Lightning strikes twice as Bolt doubles in 200 world record | Olympics 2008