Uganda's Joshua Cheptegei, the world record holder, won the men's 5,000 metres gold at the Tokyo Olympics to add to his 10,000m silver from last week.
The 24-year-old set the pace early in the 12-and-a-half-lap race but was soon overtaken by a host of his competitors on a balmy evening at the Olympic Stadium.
But with about 600m remaining he found a different gear to surge past the pack and retake the lead to win in 12:58:15.
Mohammed Ahmed of Canada clinched the silver while American Paul Chelimo claimed the bronze medal with a season's best time of 12:59:05, falling over the line after struggling at the end.
Shaunae Miller-Uibo of the Bahamas won the women's 400 metres in 48.36 seconds retaining her Olympic title, as American Allyson Felix took bronze, her record 10th Olympic medal.
Marileidy Paulino of the Dominican Republic took silver.
Miller-Uibo wrested control of the lead on the second bend and delivering her trademark final surge to become the first woman to win back-to-back Olympic titles in the event since
