A Florida sprinter, who turned 17 five months ago, broke a junior record set by Usain Bolt in the 200 meters Monday night, holding off an Olympics 100-meter favourite in the process.

Erriyon Knighton, who turned professional as a junior at Tampa’s Hillsborough High, edged Trayvon Bromell, winning the 200 in 20.11 seconds, 0.02 seconds faster than Bolt’s time for runners 18 and under. Bromell, who has run the year’s fastest 100 (9.88), ran his best 200 race since 2015 in the American Track League meet in Jacksonville.

Although Bolt ran a 19.93 when he was 17 in 2004, it happened in the year in which he turned 18. To be eligible for a U18 best, World Athletics requires that an athlete not turn 18 during the calendar year, according to a U.S. Track and Field official. The same applies to U20 records. Bolt turned 18 later in the year in which he ran the 19.93. Knighton turned 17 in January and thus cannot turn 18 this year.

Usain Bolt
Erriyon Knighton

“Statisticians also keep unofficial lists of bests by someone in each age group. This is based solely on the age of the athlete on the date the performance happened. An athlete could set an ‘age-17 best’ on a Monday and then turn 18 the next day. These are not officially recognized by World Athletics,” Susan Hazzard explained in an email to The Post.

Knighton qualified for the upcoming Olympic Trials and would be younger than any U.S. Olympic male track and field athlete since Jim Ryunin 1964, according to Olympedia.org. However, Noah Lyles, Kenny Bednarek and Terrance Laird have each run 19.81 or better, making Knighton a long shot.

A 6-foot-3 wide receiver for his high school football team, Knighton came to sprinting as a high school freshman when his football coach recruited him for track. Although he said he has been recruited by Division I football teams, choosing to go pro in track was “a no-brainer.”

“In track, the success of my career is fully in my hands,” he told Track and Field News in February, “and I know that I can do it.”