Agberto João Conceição Guimarães (born August 18, 1957) is a former Brazilian middle distance runner who competed at the international level in the 1980s. He set a personal best 800 metres time of 1:43.63 min in Koblenz 1984, a performance which made him temporarily the second-fastest South American 800m runner ever.

Guimarães first participated in major international championships at the 1980 Moscow Olympics where he placed fourth in 800 metres (see, for example, "Moscow Olympic Book" / Moskovan Olympiakirja, Tapio Pekola et al., eds., Helsinki, Finland: "Runner" / Juoksija magazine, 1980).

Guimarães came sixth in the 800 m final at the 1983 World Championships in Athletics in Helsinki. He won two gold medals and two bronze medals at the Pan American Games. Nowadays Guimarães works at the Brazilian Olympic Committee as its Olympic Solidarity Programme general manager.

International competitions Representing 1975South American ChampionshipsRio de Janeiro, Brazil3rd800 m1:51.81977UniversiadeSofia, Bulgaria4th800 m1:46.0South American ChampionshipsMontevideo, Uruguay1st800 m1:52.41979Pan American GamesSan Juan, Puerto Rico3rd800 m1:46.83rd1500 m3:41.5World CupMontreal, Canada5th800 m1:48.81UniversiadeMexico City, Mexico6th (sf)800 m1:51.3126th4 × 400 m relay3:05.611980Olympic GamesMoscow, Soviet Union4th800 m1:46.25th4 × 400 m relay3:05.91981South American ChampionshipsLa Paz, Bolivia1st4 × 400 m relay3:09.51983World ChampionshipsHelsinki, Finland6th800 m1:45.466th (sf)4 × 400 m relay3:04.46Pan American GamesCaracas, Venezuela1st800 m1:46.311st1500 m3:42.912nd4 × 400 m relay3:02.791984Olympic GamesLos Angeles, United States12th (sf)800 m1:46.6534th (h)1500 m3:49.2631985World CupCanberra, Australia3rd800 m1:45.8011988Olympic GamesSeoul, South Korea24th (h)800 m1:48.491989World Indoor ChampionshipsBudapest, Hungary11th (h)1500 m3:44.86 1Representing the Americas 2Did not finish in the final 3Did not finish in the semifinals

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