Marconato joined Benetton Treviso's youth team in 1990, and with them he won three Italian juniors club titles between 1991 and 1994. In 1993, he made his debut in Italy's top-tier level men's professional
LBA, with the senior team of
Benetton Treviso, in the 1992–93 season. However, he did not have a regular place on Treviso's roster, so he was
loaned to
Padova, where he demonstrated his talent. In the 1996–97 season, he returned to Benetton Treviso, where the team's head coach
Mike D'Antoni, gave him a more important role in the team; and in that season, Marconato won his first Italian League championship. After winning the
Italian SuperCup title and
MVP in 1997, and the
FIBA Saporta Cup title in 1999, he was named the MVP of the
Italian Cup Final Eight in 2000 (which was won by Treviso). In the following years, he won two more Italian championships (2002, 2003), three more Italian Cups (2003, 2004, 2005) and played at two
EuroLeague Final Fours (
2002,
2003). During his last season with Treviso, Marconato was also the
captain of the team. In the summer of 2005, he moved to the
Spanish ACB League club
FC Barcelona, together with his senior
Italian national team teammate
Gianluca Basile. On 14 January 2015 he signed with Montichiari of the
Italian 3rd Division. ==National team career==