2011 World Championships in Athletics – Men's 800 metres
|Events at the
2011 World Championships
|100 m hurdles||women|
|110 m hurdles||men|
|400 m hurdles||men||women|
|4 × 100 m relay||men||women|
|4 × 400 m relay||men||women|
|20 km walk||men||women|
|50 km walk||men|
The first semi-final went out fast, with a bunch finish. While Abubaker Kaki came into the event as one of the favorites, he had to qualify to the final by time as the fastest 3rd place. Both time qualifiers came from the first semi. The second semi was the opposite kind of race as kickers Nick Symmonds and Yuriy Borzakovskiy almost acted as a team to run from the front and slow the pace. The two almost formed a wall down the home stretch that frustrated the runners behind them, achieving the two slowest qualifying times into the final. The third semi final was favorite David Rudisha taking control of the race, only accelerating enough to make sure nobody passed him.
Rudisha won the gold medal after leading the race from the start. Behind him through most of the last lap, surprisingly was come from behind specialist Borzakovskiy, who was himself out-kicked by Kaki just before the finish for the silver medal. 
Prior to the competition, the following records were as follows.
|World record||David Rudisha (KEN)||1:41.01||Rieti, Italy||29 August 2010|
|Championship record||Billy Konchellah (KEN)||1:43.06||Rome, Italy||1 September 1987|
|World leading||David Rudisha (KEN)||1:42.61||Monaco||22 July 2011|
|African record||David Rudisha (KEN)||1:41.01||Rieti, Italy||29 August 2010|
|Asian record||Yusuf Saad Kamel (BHR)||1:42.79||Monaco||29 July 2008|
|North, Central American and Caribbean record||Johnny Gray (USA)||1:42.60||Koblenz, West Germany||28 August 1985|
|South American record||Joaquim Cruz (BRA)||1:41.77||Cologne, Germany||26 August 1984|
|European record||Wilson Kipketer (DEN)||1:41.11||Cologne, Germany||24 August 1997|
|Oceanian record||Peter Snell (NZL)||1:44.3||Christchurch, New Zealand||3 February 1962|
|A time||B time|
|August 27, 2011||12:05||Heats|
|August 28, 2011||18:00||Semifinals|
|August 30, 2011||21:00||Final|
|KEY:||q||Fastest non-qualifiers||Q||Qualified||NR||National record||PB||Personal best||SB||Seasonal best|
Qualification: First 3 in each heat (Q) and the next 6 fastest (q) advance to the semifinals.
Qualification: First 2 in each heat (Q) and the next 2 fastest (q) advance to the Final.
|2||1||Mohammed Aman||Ethiopia||1:44.57||Q, NR|
|3||1||Marcin Lewandowski||Poland||1:44.60||Q, SB|
|6||1||Alfred Kirwa Yego||Kenya||1:44.82||q|
|8||1||Khadevis Robinson||United States||1:45.27|
|10||2||Nick Symmonds||United States||1:45.73||Q|
|13||2||Andrew Osagie||Great Britain||1:46.12|
|21||3||Luis Alberto Marco||Spain||1:47.45|
|23||1||Antonio Manuel Reina||Spain||1:48.45|
|5||3||Nick Symmonds||United States||1:45.12|
|7||8||Alfred Kirwa Yego||Kenya||1:45.83|
- "Rudisha takes gold as Isinbayeva fails to reach the heights". CNN. 30 August 2011. Retrieved 30 August 2011.
- 800 metres results at IAAF website