Mazza started from the lower Argentine divisions with
Juventud de Pergamino. After playing with the club showing great potential it was matter of time to generate interest by several clubs both in Argentina and Europe (including
Vitesse Arnhem,
SC Heerenveen as well as
Genoa,
Juventus and
Ajax). In 2007, he went on trials to the giants
River Plate and stayed. He signed his first contract, and served in the reserve-team till he stopped due to a severe injury. In early 2009, during the first matches with
River Plate reserves, he showed his talent, but suffered a broken ankle in a training from teammate
Mauro Diaz took him more than four months of recovery. After recovering from his injury and take physical and footballing rhythm while on loan at his home club
Juventud de Pergamino, he returned to the preseason with the
River Plate reserve squad. In January 2012, Paul Mazza sign
Douglas Haig playing in
Primera B Nacional, after a test run, making his debut at United Youth University of San Luis in an honoured match for
Omar Jorge, entering the second half. In the summer of 2014, after playing for the club for two seasons, he refused the club's offer for renewal, and signed a four years' contract with Greek
Super League Greece side
Asteras Tripolis. ==References==