Justin Gatlin insists he has "got more left in the tank", despite clocking 9.8 seconds in the US Olympic trials' 100m.
The American sprinter takes on compatriot Tyson Gay on Friday in Paris at the latest Diamond League event.
Gatlin, 30, won gold at the 2004 Athens Olympics but was later handed a four-year ban for a doping offence he has always strenuously denied.
"I'm more focussed, more determined and I'm wiser now," said Gatlin, who won the recent trials in Eugene, Oregon.
"Eight years ago, it was more of a dream that was accomplished [to become Olympic champion] so now I need to accomplish this mission."
Gatlin, who beat Gay by only 0.06 secs at the trials, always maintained his innocence after testing positive for excessive testosterone at the 2006 Kansas Relays.
"I have never knowingly used any banned substance, nor have I allowed anyone to administer one to me," he said at the time of his appeal.
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