After beginning his career at Cerro, Mastriani moved to Italy with Parma, but served several loan stints and left the club without debuting. He then played in Uruguay and Mexico before scoring in a prolific rate with Guayaquil City in Ecuador.
Mastriani's family hails from Italy, with his ancestors moving to Montevideo in the mid-19th century. His official surname was supposed to be "Mastroianni", but was registered as "Mastriani" after an error from the registry office.[1]
Club career
Cerro
Mastriani joined Cerro's youth setup in 2006, from lowly CSyD Sauce Baby Fútbol, after rejecting an offer from Defensor Sporting.[2] He made his first team – and Primera División – debut for the club on 14 August 2011, starting and scoring the equalizer in a 3–1 home win over Cerrito.
On 25 September 2011, Mastriani scored a brace in a 2–1 home win over Liverpool Montevideo. In his first senior season, he was Cerro's top scorer with 12 goals, being an ever-present figure as the club finished in a mid-table position overall.
Parma and loans
In July 2013, amidst strong rumours to a move in the previous transfer windows,[3] Mastriani moved abroad and signed for Italian Serie A side Parma.[4] On 1 August, however, he was loaned to Serie B side Crotone, for one year.[5]
After featuring rarely, Mastriani returned to Parma on 21 January 2014,[6] but moved on loan to Slovenian side Gorica on 1 February, as the club had a partnership with Parma.[7] On 27 August 2014, he switched teams and countries again, after agreeing to a one-year loan deal with Olhanense of the Portuguese Segunda Liga as a part of the deal which saw Lucas Souza move in the opposite direction.[8]
Rentistas
On 5 August 2015, after Parma's bankruptcy, Mastriani returned to his home country and signed for Rentistas.[9] In July 2016, he moved to Ascenso MX side Tampico Madero on loan.[10]
In January 2018, Mastriani moved to Boston River,[13] where he was the club's top scorer during the year, with seven goals.
Guayaquil City
On 2 January 2019, Mastriani was presented at Ecuadorian Serie A side Guayaquil City.[14] An immediate first-choice, he scored a career-best 14 league goals in his first season, adding more 10 in his second.
Barcelona SC
On 21 January 2021, Mastriani signed for Barcelona SC also in the Ecuadorian top tier.[15] He was regularly used in the club's 2021 Copa Libertadores run, as the club reached the semifinals of the competition.
On 25 January 2024, in his first match of the season, Mastriani scored five goals in 68 minutes in a 6–0 Campeonato Mineiro home routing of Pouso Alegre.[19]
Athletico Paranaense
On 29 January 2024, Mastriani agreed to a three-year deal with Athletico Paranaense,[20] for a rumoured fee of € 2 million.[21]