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The world records set by Kenyan Reynold Cheruiyot and Ethiopian Gudaf Tsegay this year are now official after they were ratified.

They achieved the times at the Wanda Diamond League Final in the US city of Eugene September 16-17.

Cheruiyot, who is Kenya's world U20 1500m champion, crossed the line in fifth in the Bowerman Mile in a time of 3:48.06 minutes.

By doing so, he improved the world U20 mile record by more than a second, which had stood intact for 14 years.

The previous record of 3:49.29 was set by Kenyan-born Ilham Tanui Ozbilen, who now represents Turkey, in Oslo on July 3, 2009.

The race in which Cheruiyot ran in September was won by Norwegian Jakob Ingebrigtsen, whose time of 3:43.73 was just 0.6 seconds shy of the senior world record.

A day after Cheruiyot set a new junior world record, Ethiopian Tsegay made her mark too in the senior women — a second for her at senior level.

She improved the world 5000m record with a time of 14:00.21.

Tsegay shaved nearly five seconds off the previous world record of 14:05.20 set by Kenyan Faith Kipyegon in France's capital Paris earlier in June.

Meanwhile, the world records of pole vaulter Mondo Duplantis and shot-putter Ryan Crouser have also been ratified.

Swedish-American Duplantis set a new world record in Eugene with his 6.23-metre leap in September.

In the men's shot put, American Crouser threw a distance of 23.56 metres on home soil earlier in May in Los Angeles.

This was at the USATF Los Angeles Grand Prix, the season’s sixth World Athletics Continental Tour Gold meeting.