Playing as shooting guard or small forward, he had a long career in the Italian leagues, finishing as the top scorer of the top-tier level Serie A, in the 1993–1994 season.
Boni played in the youth ranks of birth town side Fulgor Codogno before joining Unione Cestistica Piacentina of the fifth division Serie C2 in 1982.
[2] He stayed 9 years with the Tuscany based club, forming a famous duo with Andrea Niccolai (in Italian) that saw them nicknamed "i gemelli" (the twins).
[3] Boni denied the doping charges despite the B-sample also coming back positive, he claimed to have unwittingly used an American drug to cure a fever.
[12] Signing with Serie A side Calze Pompea Roma in February 1998, Boni only played a handful of games before a doping test revealed the presence of the anabolic steroid clostebol in his body after a 15 March match the same year.
Risking a life suspension for his second doping offence, the 35-year-old was instead suspended for 2 years in April 1998, with the admission by doctor Andrea Billi of using a spray containing the product on the player not given credence to.
However the player, vocally claiming his innocence, appealed the sentence, it was overturned shortly after by the federal court who accepted Billi's story.
[15] Before playing in the competition he left the side in the 2014 preseason, citing the impossible conciliation of training with his other activities, including his role as vice president of GIBA (the Italian players union).
[1] Boni won the FIMBA Over 50 basketball World Cup with the Italian representative side in July 2013, scoring 45 points in a 79–73 victory, coincidentally played in Thessaloniki.