The first round had split a full roster of runners into nine heats with the first two gaining a direct qualification and then the next six fastest across all heats advancing to the semifinals. The top two runners in each of the three semifinal heats moved on directly to the final, and they were immediately joined by the next two fastest from any of the semifinals.
The final was tactical, like the previous several Olympics with most athletes running faster to qualify than they ran in the final.Yuriy Borzakovskiy andMouhssin Chehibi lagged significantly off the pace.World championDjabir Saïd-Guerni and 2004 world leaderWilfred Bungei battled for the lead, chased closely by Bungei's second cousin, world record holderWilson Kipketer, Borzakovskiy and Chehibi joined the back of the pack. It seemed like Borzakovskiy was reluctant to catch the leaders, then realized the pace was not too fast, with 50 metres before the end of the first lap, he noticeably accelerated from dead last to join the fight.Mbulaeni Mulaudzi, who had lucked into the slowest qualifying time in the semi-final round, ran comfortably in a box inside of Kipketer through 500 meters. A lead group broke away on the backstretch. Guerni fell back as the cousins battled for the lead through the final turn, with Mulaudzi a step back and Borzakovskiy the final athlete in the breakaway. Coming off the turn, Kipketer pounced and took off for the finish in lane two. But the always fast closing Borzakovskiy came along the outside from 5 meters back to catch Kipketer 30 meters out. Not giving up the fight, Mulaudzi pulled even with Kipketer. Borzakovskiy held his hands up with a meter victory, while Mulaudzi out leaned Kipketer for silver.[3][4]
This was the 25th appearance of the event, which is one of 12 athletics events to have been held at every Summer Olympics. All of the finalists from 2000 returned except for the champion: silver medalistWilson Kipketer of Denmark, bronze medalistDjabir Saïd-Guerni of Algeria, fourth-place finisher (and 1996 silver medalist)Hezekiél Sepeng of South Africa, fifth-place finisherAndré Bucher of Switzerland, sixth-place finisherYuriy Borzakovskiy of Russia, seventh-place finisherGlody Dube of Botswana, andAndrea Longo of Italy, who had been disqualified in the final due to obstruction. The three latest world champions were Saïd-Guerni (2003), Bucher (2001), and Kipketer (1999, 1997, and 1995); Kipketer still held the world record. Borzakovskiy (2003 world runner-up) andWilfred Bungei of Kenya (who held the #1 ranking) were also serious contenders for gold.[2]
Bolivia, Bosnia and Herzegovina, Kazakhstan, Lithuania, Palestine, Turkmenistan, Ukraine, Uzbekistan, and Vietnam appeared in the event for the first time. Great Britain made its 24th appearance, most among all nations, having had no competitors in the event only in the 1904 Games in St. Louis.
The qualification period for athletics was 1 January 2003 to 9 August 2004. For the men's 800 metres, eachNational Olympic Committee was permitted to enter up to three athletes that had run the race in 1:46.00 or faster during the qualification period. If an NOC had no athletes that qualified under that standard, one athlete that had run the race in 1:47.00 or faster could be entered. The maximum number of athletes per nation had been set at 3 since the 1930 Olympic Congress.
The men's 800 metres had a much larger field (79 entered and 72 started, compared with 61 starters in 2000) but again used a three-round format, the most common format since 1912 though there had been variations. The "fastest loser" system introduced in 1964 was used for the first two rounds. There were nine first-round heats, each with 8 athletes; the top two runners in each heat as well as the next six fastest overall advanced to the semifinals. There were three semifinals with 8 athletes each (except that one had an extra runner due to an advancement by obstruction rule in the first round); the top two runners in each semifinal and the next two fastest overall advanced to the eight-man final.[2][5]