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TOKYO — When Sydney McLaughlin-Levrone powered though the final curve of the 400-meter final at world championships, she glanced to her right and saw something that hadn’t been there in a while.

Another runner.

She had a race on her hands.

The best way to explain how McLaughlin-Levrone became the first woman in nearly 40 years to crack the all-but-unscalable 48-second mark in the 400 is that the opponent she beat Thursday night on a rain-glistened track in Tokyo, Marileidy Paulino, broke 48 seconds, too.

“You don’t run something like that without amazing women pushing you to it,” McLaughlin-Levrone said.

The final numbers in this one: McLaughlin-Levrone 47.78 seconds. Paulin

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