As of now, Lamont Marcell Jacobs is at the top of the world in terms of men's 100-meter sprint. He achieved this feat by winning the gold medal at the Tokyo Olympics 2020 with a time of 9.80 seconds. Jacobs, an Italian sprinter, became the first European to win the Olympic title in the men's 100-meter sprint since Linford Christie in 1992.

Jacobs' victory was a surprise to many, as he was relatively unknown on the international stage before the Olympics. However, he had been steadily improving his performance over the years and had shown promising results leading up to the Games. His win not only made history for Italy but also marked a significant shift in the sprinting world.

Ferdinand Omanyala, a Kenyan sprinter, made headlines earlier this year when he set a new African record in the 100-meter race with a time of 9.77 seconds during the national trials. However, his time was not recognized as an official world record due to a lack of required doping control procedures. While Omanyala did not compete in the Olympics, his impressive performance showcased his potential and placed him among the top sprinters in the world.

Fred Kerley, an American sprinter, won the silver medal in the men's 100-meter race at the Tokyo Olympics. He finished just 0.04 seconds behind Jacobs with a time of 9.84 seconds. Kerley had previously excelled in the 400-meter event, winning silver at the 2019 World Championships. His transition to the 100-meter race and subsequent success demonstrates his versatility and talent as a sprinter.

It is important to note that the world rankings in athletics can change rapidly, especially in sprinting events where the margins are often extremely close. However, as of now, Lamont Marcell Jacobs holds the title of the fastest man in the world, having won the Olympic gold medal in the men's 100-meter sprint.