This is one of the saddest things I seen since the Olympics started. Chinese hurdler Liu Xiang falls on the first hurdle in the 110-meter hurdles. The same thing happened to him in Beijing in 2008. He has struggled with an torn Achilles. After missing the hurdle he limped his way through the rest of the race. It was one of the hardest things to watch. Xiang is a the former world-record holder in the event and won the gold medal in the 2004 Athens games. This is most likely his last Olympics.