The record, step by step
The men's 1500m begins with Filbert Bayi's 3:32.16 in 1974. In 1998 Hicham El Guerrouj ran 3:26.00 in Rome, a mark unbroken for more than a quarter-century. On the women's side, Faith Kipyegon set the world record of 3:48.68 in 2025.
Japan's progression
Takashi Ishii's 1977 men's record stood for many years; the mark fell through the 2000s and 2010s, and in 2021 Kazuki Kawamura brought it to 3:35.42. On the women's side, Nozomi Tanaka lowered the record repeatedly across 2020–21, reaching 3:59.19 in 2021 — the first Japanese woman under four minutes.