New York - Ethiopia's Yomif Kejelcha crushed the world indoor mile record on Sunday with a time of 3:47.01 at the Bruce Lehane Invitational in Boston.
The 21-year-old broke a record that was older than he is - the mark of 3:48.45 set by Morocco's Hicham El Gerrouj on February 12, 1997.
It was third time lucky for Kejelcha, who narrowly missed out on breaking world indoor records in his two previous races.
He finished just 0.01 outside the world indoor mile record at the Millrose Games with a time of 3:48.46, and was then beaten to the world indoor 1 500m record in Birmingham one week later when compatriot Samuel Tefera won in 3:31.04.
Kejelcha had set out in Boston to break the indoor world records for both the mile and 1 500m, but his 1 500m split was confirmed at 3:31.25 - third-fastest ever behind Tefera and El Guerrouj.