In 2003, he finished fourth in the Italian Open Masters ICA Junior class, behind Sébastien Buemi, Stefano Coletti and Miguel Molina.

In November 2008, Mancinelli took part in the Italian Formula Renault 2.0 Winter Series, which was contested over two races at the Imola circuit.

[2] Mancinelli also took part in eight races of the 2009 Eurocup Formula Renault 2.0 season, taking a best result of sixth at the opening round in Barcelona to be classified in nineteenth place in the final standings.

[3] He returned to the Eurocup at the 2010 season-opening round at Ciudad del Motor de Aragón, finishing the races in seventh and ninth places.

In October 2009, Mancinelli tested a Formula Renault 3.5 Series car at Motorland Aragón for newly crowned team champions Draco Racing.