Olympic gold-medal sprinter Justin Gatlin, considered one of the fastest men in history, is part of the delegation that will represent the U.S. at the Pan American Games that begin in Lima, Peru, next week.

Gatlin, the 37-year-old reigning world champion in the 100 meters, is coming off a close win at the Diamond League meet in Monaco. He will represent the U.S. in the 4x100 relay.

The U.S. Olympic and Paralympic Committee on Thursday announced the list of athletes who will represent the country from July 26 to Aug. 11. The roster will number 643 once the women's artistic gymnastics team is trimmed to five.

Nathan Adrian, an eight-time Olympic medalist who was diagnosed with testicular cancer in January, headlines a strong swimming contingent for the U.S. Shooter Kim Rhode, a six-time Olympic medalist, will compete in her sixth Pan Am Games.

The competition is the third-largest international multisport event, after the Olympics and the Asian Games. Lima 2019 will feature 39 sports and 61 disciplines, with 6,680 athletes expected to compete from 41 delegations.

The U.S. will compete in every sport except baseball, soccer and bodybuilding -- one of two sports along with surfing making their Pan Am debuts.

American athletes will seek qualification to the 2020 Tokyo Olympics in a dozen sports. California leads the U.S. delegation with 145 athletes, followed by New York with 48 and Florida with 40.

The U.S. topped the medal standings at the 2015 Pan Ams in Toronto at 265, including a Games-best 103 gold medals.