Bolt enters the Olympics not in the top three in the world in either of his sprints.
It's been 20 years since the "Magnificent Seven" won gold in Atlanta, so take a trip down memory lane and find out what they're up to now.
Olympic sports now available on NBCSN, Universal HD (separate from Universal Sports Network), & streaming on NBC Sports Live Extra.
After a retest of stored samples, the IOC has discovered that 45 athletes, including 23 medalists, have tested positive for PEDs.
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Watch video of the record-breaking run.
"Russia appears unable to fulfil its IPC membership obligations in full."