One-day races and Classics Marco António Chagas Martins (born 19 November 1956) is a Portuguese former racing cyclist who is a cycling commentator on RTP.

A professional rider from 1976 to 1990, he won the Volta a Portugal four times, in 1982, 1983, 1985 and 1986, making him the second most successful rider in the competition, after David Blanco.

[1] Chagas was stripped from his win at the 1979 Volta a Portugal due to doping.

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