Saponari signed with the St. John's IceCaps of the American Hockey League at the tail-end of the 2012–13 season, playing in seven regular season games and scoring a goal and an assist. He signed with the Milwaukee Admirals of the AHL for the 2013–14 season in what would be his only consistent season in the league, playing fifty-eight games and scoring thirty-three points. Afterwards, he played predominantly in the ECHL over the next two seasons and only made brief appearances in the AHL for the Hartford Wolf Pack, Portland Pirates and the Lake Erie Monsters before returning to the Admirals for a brief spell there as well.
In the midst of his third season with Krefeld Pinguine in 2020–21, Saponari registered just 2 assists through 8 regular season contests before opting to mutually terminate his contract on February 1, 2021.[9]
On June 1, 2021, Saponari returned to the DEL, signing an initial one-year deal with Augsburger Panther.[10]
In his second year with Augsburg in the 2022–23 season, Saponari posted 3 goals and 15 points through 39 regular season games, however was unable to help prevent the Panthers finish in a relegation position. He left the club at the conclusion of his contract on March 17, 2023.[11]
On June 13, 2023, Saponari opted to continue his career in Germany, joining second tier club, ETC Crimmitschau of the DEL2.[12]