In 2015 he won the Italian Premoto3 250 4t championship, a CIV category in which he won 7 out of 8 races. On 15 December 2015 he joined the VR46 Academy, remaining in the CIV but moving up a category, moving to Moto3 for the 2016 season in the RMU Racing team. After a season in the CIV Moto3 where he finished 12th, in 2017 he made his debut in the CEV Junior World Championship with SKY Racing Team VR46 where he finished 25th.
In 2018 he graduated to the Moto3 World Championship where he replaced Enea Bastianini in the Estrella Galicia team.
He made his Grand Prix racing debut as injury replacement for fellow VR46 Academy member Nicolò Bulega at the Japanese Grand Prix. A week later he scored his first career podium in Moto3 at Phillip Island, and finished off the season with a 10th place in Valencia. Vietti scored 24 points total, six more than Bulega, despite taking part in 14 races less.
Following his impressive debut performances, Vietti competed full-time in the 2019 Moto3 World Championship, with Bulega moving up to the Moto2 category.[1] Vietti hit the ground running, scoring regular top 10 points at almost every weekend, grabbing three 3rd places in Jerez, Barcelona, and Motegi, scoring 135 points total, finishing sixth overall in the championship standings, and winning rookie of the year.
Vietti started the 2020 Moto3 World Championship season well, with a third place in Jerez in the third race of the year, earning Vietti his fifth career podium in Moto3, all third places. A month later in Austria, Vietti scored his first victory in the category, followed by a second place in Misano, and another victory in France. Overall Vietti closed a strong year with two victories, four podiums, 146 points, and a fifth place finish in the final standings, in his final year of Moto3.
Moto2 World Championship (2021–present)
Following Nicolò Bulega's performances, Vietti was promoted to Moto2 for the 2021 season, partnering Marco Bezzecchi at Sky Racing Team VR46. Vietti slowly improved as the season went on, with his three best results coming at the last three races of the year, fourth in Misano, sixth in Portimao, and fourth in Valencia. He finished the season with 89 points, good for 12th in the final standings, and third among rookies, behind Raúl Fernández, and Ai Ogura.
