[3][4][5][6] At the 2014 Summer Youth Olympics, in Nanjing, China in August 2014, Sabbioni won a gold medal in the 100 metre backstroke along with Evgeny Rylov of Russia as they both swam the exact same time of 54.24 seconds in the final.

[6][11] The following month, he won a bronze medal at the 2016 European Aquatics Championships in London, England, in the 100 metre backstroke with a time of 54.19 seconds.

[10][13] Later in December, at the 2017 European Short Course Swimming Championships in Copenhagen, Denmark, Sabbioni broke his own national record in the 100 metre backstroke again, lowering the mark to 49.68 seconds and winning the silver medal in the event.

[16] Sabbioni was one of two swimmers, the other being Dylan Carter of Trinidad and Tobago, to have wedge equipment malfunction during his backstroke start in the 100 metre backstroke, and the only swimmer to have the technology fail a second time after officials assured him nothing would happen, this story was picked up and covered by newspapers The Seattle Times and The Korea Herald.

[16][17] In the semifinals, Sabbioni finished with a time of 53.71 seconds, tied for 12th overall with Daniel Martin of Romania, and did not advance to the final of the event.

[20] On the first day of competition, 2 November, he placed third in his prelims heat of the 50 metre backstroke with a time of 23.50 seconds and did not advance to the semifinals.