This was the 23rd appearance of the men's 100 metre freestyle. The event has been held at every Summer Olympics except 1900 (when the shortest freestyle was the 200 metres), though the 1904 version was measured in yards rather than metres. Seven of the eight finalists from the 1996 Games returned: two-time gold medalist
Alexander Popov of Russia, silver medalist
Gary Hall, Jr. of the United States, bronze medalist (and 1992 silver medalist)
Gustavo Borges of Brazil, fourth-place finisher
Pieter van den Hoogenband of the Netherlands, fifth-place finisher
Fernando Scherer of Brazil, sixth-place finisher
Pavlo Khnykin of Ukraine, and eighth-place finisher
Francisco Sánchez of Venezuela. Popov had recovered from a near-fatal stabbing in 1996 to win the 1997 European championship and repeat as world champion in 1998. His 1994 world record had stood until the start of the Games; in the freestyle relays, however, hometown hopeful
Michael Klim (the 1998 world championship runner-up) had broken that record with his first leg split. Van den Hoogenband won the 200 metre freestyle earlier in Sydney. The Republic of the Congo, the Czech Republic, Equatorial Guinea, the Ivory Coast, Mauritius, Mongolia, Niger, Nigeria, Slovenia, and Tajikistan each made their debut in the event. The United States made its 22nd appearance, most of any nation, having missed only the boycotted 1980 Games. ==Competition format==