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FastestThings

Men's 400 Metres

Jeremy Wariner

American athlete. men's 400 m mark of 43.45 seconds at Osaka on 31 August 2007, the personal best on the World Athletics all-time list.

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Race time

43.45s

men's 400 m, Osaka. One personal best per athlete.

OfficialWorld Athletics (opens source in a new tab)

Mechanism

Why it's so fast

Jeremy Wariner's 400 metres is a sprint long enough to hurt. The fast marks are the athletes who slow down the least, not only the ones with the best 100 metre speed.

  1. Distribution

    Go through the first 200 too hard and the last 100 collapses. The times at the top of this list are paced so the second half still looks like a sprint.

  2. One lap, still a sprint

    There are blocks and a bend and no time to settle into a distance rhythm. Marathon economy is a different event. This one is speed that has to last about fifty seconds.

  3. The legal mark

    Jeremy Wariner's entry names the meet because that is the race the all-time list is pointing at. A training rep is not the row.

Nearby on this list: Matthew Hudson-Smith and Michael Norman.

Provenance

Every measurement

Claimed, measured and official figures side by side, each with its source. The ranked figure is marked.

  1. 43.45sRanked figure

    men's 400 m, Osaka. One personal best per athlete.

    Official
    World Athletics (opens source in a new tab)

Reference

Specs

Country
United States
Event
men's 400 m
Mark
43.45 s
Venue
Osaka

Context

Background

Jeremy Wariner's ranked men's 400 m time is 43.45 seconds at Osaka on 31 August 2007. World Athletics, Athletic Stats (refreshed 5 October 2026) and Track & Field News print that time and date.

The list is one event. A mark from another distance is a different page, with its own slug. Wind above +2.0 m/s is not legal and is not stored. Lower is faster.

Spot a wrong number?

Every report is read by a person, and corrections are dated on the page.