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Caster Semenya runs fastest 800m in 10 years; No. 4 all-time (video)

Caster Semenya ran the fourth-fastest women’s 800m ever, stepping on the gas like never before to clock 1:54.25, a personal best by .91, at a Diamond League stop in Paris on Saturday.

Only Olympic and world silver medalist Francine Niyonsaba was within a half-second of Semenya after one lap, and the only runner within 1.83 seconds of her at the finish. Semenya dominated without the aid of a pacer.

Often during her nearly three-year undefeated streak, Semenya has held back in the first 600 meters before charging on the home stretch. Not this time.