[1][2] At the 2015 FINA World Junior Swimming Championships held in Singapore, he finished 5th in the 100 metre freestyle.,[3] and 4th in the 4 × 100 m freestyle relay.

The syndrome reduced his performance and ended his dream of defending the Brazilian team at the 2016 Summer Olympics in Rio de Janeiro.

At the 2018 Pan Pacific Swimming Championships in Tokyo, Japan, Spajari won the gold medal in the Men's 4 × 100 metre freestyle relay, along with Gabriel Santos, Marco Ferreira Júnior and Marcelo Chierighini.

[9] At the 2019 World Aquatics Championships in Gwangju, South Korea, in the Men's 4 × 100 metre freestyle relay, he finished 6th, helping Brazil qualify for the Tokyo 2020 Olympics.

[10] At the 2019 Pan American Games held in Lima, Peru, he won a gold medal in the Men's 4 × 100 metre freestyle relay, along with Breno Correia, Marcelo Chierighini and Bruno Fratus, with a time of 3:12.61, a new Pan American Games record.