Career
He set a personal best 800 metres time of 1:43.63 minimum in Koblenz 1984, a performance which made him temporarily the second-fastest South American 800 m 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.
Nowadays Guimarães works at the Brazilian Olympic Committee as its Olympic Solidarity Programme general manager.