After a short playing career, he became head coach at the BTT Tennis Academy in Barcelona, where he works with Sousa.

[6] Marques pursued a degree in communication studies at Universidade Nova de Lisboa, but never finished,[6] and he also attended at the Autonomous University of Barcelona, Spain.

[3] From 2000 to 2003, Marques practiced in the National Tennis Center in Oeiras, Portugal, where he was coached by João Cunha e Silva and Bernardo Mota.

[6] During his first year there, Marques shared a rented house with his future coachee João Sousa to reduce expenses.

[12] Marques made his main draw debut in 2001 in a junior tournament at the Taca Group Bowl in El Salvador, with Frederico Gil as his doubles partner.

[14] Marques never entered the main draw of an ATP tour tournament, but he played the qualifying rounds of the Estoril Open in 2002, 2004 and 2005.

[4][6] However, his final professional match would come later that year, at a Futures doubles tournament in Russia, where he partnered with his coachee Alexander Lobkov.

[1][12][16] The following season, Marques worked with Chinese Ma Yanan and supported the China Davis Cup team.

[4][12][18] Other players Marques coached for a short period include Teymuraz Gabashvili, Arnau Brugués-Davi, Íñigo Cervantes, Steven Diez, James McGee, Denis Matsukevich, Valery Rudnev and Wu Di.

[12][20] Since 2014, Marques is sponsored by KTM, which helps him cover the logistics associated with touring alongside Sousa.