TAMPA, Fla. — When Erriyon Knighton, a few months past his 18th birthday, became the fourth-fastest 200-meter runner in history on April 30, his fellow sprinter Michael Cherry tweeted in amazement, “That boy got algebra on Monday.”
Knighton was still weeks away from graduating high school when he ran half a lap around the track in 19.49 seconds, lowering his own world junior record once held by Usain Bolt, at the L.S.U. Invitational in Baton Rouge, La.
Knighton had turned professional in…
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