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Usain Bolt says this will be his final Olympic race. (Michael Phelps said that too once, but that’s another story.)

The astonishing sprinter is back on the track Friday, looking to add to his medal stash as part of the Jamaican team in the 4×100 relay. Bolt and Jamaica won the event at the Beijing and London Olympics, where the team set the world and Olympic records.

So far, there’s only one opponent that can really beat Bolt — and that’s time.

Bolt romped in the 200 meters Thursday night, but finished in 19.78 seconds, .59 short of his own world record. Still, that gave him Olympic gold medal No. 8 and a third straight 200 title to go with the same trifecta in the 100 meters.

As for his Rio Olympic goals, Bolt said immortality was the main one.

“What else can I do to the world to prove I am the greatest? I’m trying to be one of the greatest. Be among Ali and Pele,” Bolt said.

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