In 1991, just a month before the World Championships, Mitchell set his first world record in the 4 x 100 meters relay of 37.67 at Zürich. At the World Championships, Mitchell was again a member of the American 4 x 100 meters relay team, in which he set a new world record of 37.50 in the final. Mitchell also won a bronze medal in the individual 100 meters race, just 0.01 seconds shy of the world record.
In 1992, Mitchell won his first United States National Championships title in the 100 meters (he repeated this victory in 1994 and 1996). At the BarcelonaOlympics, Mitchell ran his third world record in 4 x 100 meters relay of 37.40 and won again a bronze medal in the 100 meters race.
At the 1993 World Championships, Mitchell won his third bronze at the international championships in individual 100 meters and his third gold in relay event with a world record, as this time the American team equaled their own world record of 37.40.
In 1998, Mitchell was banned by International Association of Athletics Federations for two years after a test showed high levels of testosterone. They did not accept his defense of "five bottles of beer and sex with his wife at least four times... it was her birthday, the lady deserved a treat."[4] Mitchell made his final international appearance at the 2001 World Championships, where his team finished first in the 4 x 100 meters relay, but was subsequently disqualified because of BALCO scandal involvement by a teammate.
On May 1, 2008, it was announced that the U.S. government, in its trial against Trevor Graham, would have Mitchell, as well as Antonio Pettigrew as witnesses, with Mitchell to testify that Graham injected him with human growth hormone.[5]
^Mitchell, John N. "Olympian Mitchell honored", Courier-Post, October 4, 1992. Accessed December 24, 2024, via Newspapers.com. "Dennis Mitchell has spent most of his life running faster than most would ever dream possible. But Mitchell, who Saturday returned to the Edgewood track (paved since his 1984 graduation) that gave birth to his career, slowed down long enough to pass on some advice to today's students at his alma mater. 'I like to stress to the kids of today, in these schools and 1 neighborhoods, that they have to stay straight,' said Mitchell, in town to be honored by Winslow Township and to receive a proclamation from Mayor Al Brown proclaiming Saturday Dennis Mitchell Day."
^F Club, Hall of Fame, Gator Greats. Retrieved December 18, 2014.
Held over 60 yards from 1906 to 1986, with the exception of 1933–39 (60 meters). Held over 55 meters from 1987–90. 75-yard winners (1906-15) are listed separately.