Liu Xiang flashback: from 2001-2007

File photo taken on Aug. 27, 2004 shows Chinese hurdler Liu Xiang starting off in the men's 110m hurdles final at the Athens Olympics in Athens, Greece. Liu Xiang won the gold medal of the event.

File photo taken on Aug. 27, 2004 shows Chinese hurdler Liu Xiang (C) running in the men's 110m hurdles final at the Athens Olympics in Athens, Greece. Liu Xiang won the gold medal of the event.

File photo taken on Aug. 27, 2004 shows Chinese hurdler Liu Xiang celebrating after winning the gold medal in the men's 110m hurdles final at the Athens Olympics in Athens, Greece.

File photo taken on Aug. 27, 2004 shows Chinese hurdler Liu Xiang celebrating with Chinese national flag after winning the gold medal in the men's 110m hurdles final at the Athens Olympics in Athens, Greece.  

File photo taken on Aug. 27, 2004 shows Chinese hurdler Liu Xiang looking at his gold medal during the awarding ceremony of the men's 110m hurdles at the Athens Olympics in Athens, Greece.