Lamont Marcell Jacobs Jr. is an Italian track and field sprinter and former long jumper. He is the 2020 Olympic 100 metres champion, the 2022 60 metres world champion, the 2022 European 100 metres champion, the winner of the 100m in the 2020 olympics and a member of the gold medal-winning 4 × 100 m relay team at the 2020 Olympics. He currently holds the 100 metres European record, the 60 metres European record, and is the first Italian to ever qualify for and win the men's 100 metres Olympic final.

The men's 100 metres event at the 2020 Summer Olympics took place on 31 July and 1 August 2021 at the Olympic Stadium. 84 athletes were expected to compete; 27 nations used universality places to enter athletes in addition to the 56 qualifying through standard time or ranking. 78 athletes from 59 nations competed. Marcell Jacobs won the gold medal, establishing twice, semifinal and final, the new European record, Italy's first medal in the men's 100 metres. The United States extended its podium streak in the event to six Games with Fred Kerley's silver, only third at the U.S. Trials. Canadian Andre De Grasse won his second consecutive bronze medal in the 100 metres establishing his personal best. With Usain Bolt retired, Jamaica's three-Games gold medal streak ended.