Justin Gatlin of the U.S. celebrates after setting a new 100 metres world record at the Qatar Super Grand Prix, with a time of 9.76 seconds, in Doha in this May 12, 2006 file photo. Gatlin is appealing against a four-year doping ban for testing positive for testosterone in 2006. To match feature OLYMPICS/DOPING-GENES REUTERS/Fadi Alassaad/Files (QATAR)
REUTERS/FADI AL-ASSAAD