Saucy's first year in single seaters was in 2016 when he drove RC Formula and later GSK Grand Prix in the V de V Challenge Monoplace. The three podiums Saucy scored on his way to fourth in the championship were all second places in the three races at Circuit de Nevers Magny-Cours.[2]
Saucy raced his first season in ADAC Formula 4 in 2018 where he raced as a guest driver for Jenzer Motorsport like he did the year previously in the Italian F4 championship.[4] In the two races he raced he finished 11th and fifth.
Saucy once again raced for Jenzer in Italian F4 until the final race of the season where he made the switch to the French team R-ace GP.[5] His best result was fifth and he also scored a double pole position at round 3 in Monza, putting him 11th in the standings with 63 points.[6]
Following on from the last race of 2018, Saucy drove for R-ace GP again in Italian F4 for selected rounds.[9] He finished the season in 15th while only competing in three rounds; his highest finish being a fourth place at the Red Bull Ring.[10]
Saucy's first year in Formula Renault was in 2017 when he raced for AVF by Adrián Vallés.[11] He only competed in the first four rounds, and had a best finish of 12th in the championship.
2019
Saucy returned to Formula Renault Eurocup in 2019 for the final two rounds with R-ace GP.[12] Competing as a guest driver, Saucy would finish fifth in his first race, and proceed to finish 12th in the remaining three races.[13]
At the beginning of 2020, Saucy signed up to drive in the Toyota Racing Series with Giles Motorsport.[17] Securing two second places in the campaign, he placed sixth in the standings.[18]
For 2021, Saucy remained with ART Grand Prix competing in the Formula Regional European Championship by Alpine, the merger of the Formula Renault Eurocup and the Formula Regional European Championship. His teammates were Gabriele Minì and Thomas ten Brinke.[19] He started the season off in a dominant fashion, winning the second race of the season at Imola and following that up with two victories in Barcelona.[20][21] After a point-less round in Monaco and a disqualification from the lead in France, courtesy of a part having been reassembled in the wrong direction following post-race scrutineering, he returned to winning ways in the second race at Paul Ricard.[22][23][24] The Swiss driver dominated the next weekend at the Circuit Zandvoort with two pole positions and two race wins.[25][26] Saucy started the first race at Spa-Francorchamps in 24th courtesy of a mixed-up qualifying session, but he was able to fight back to eighth by the checkered flag.[27] He started the second race from pole and achieved his seventh victory of the season.[28] In the seventh round of the campaign Saucy once again scored a race win, this time inheriting the top step of the podium after a penalty was handed to initial winner Franco Colapinto for track limit breaches.[29] Saucy scored his first podium that was not a win in the next round, coming third in race 2 in Valencia, and went into the penultimate round with a 78-point gap on his closest rival Hadrien David.[30] He then finished the first race at Mugello in fifth place, and with his French adversary ending up 23rd, Saucy was crowned champion with three races left to go.[1] Saucy ended the season with a total of eight victories, eight podiums, 277 points and ten podiums, meaning that he stood on the podium after precisely half of all races.[31]
In November 2021 Saucy partook in the post-season test of the FIA Formula 3 Championship with ART Grand Prix, partnering Victor Martins and Juan Manuel Correa.[32][33] A few days after the test he was announced by ART to be one of the team's drivers for the 2022 season.[34] He qualified fourth on his debut, beating both his teammates.[35] After starting out the season with a retirement caused by a collision with teammate Martins, in which the Swiss was given a grid drop,[36] Saucy scored his first podium in the category in the feature race in Sakhir.[37] At the next round in Imola, the Swiss driver was on course for another third place, before being taken out by Ollie Bearman on the final lap.[38] From there, Saucy experienced a drop in performances, having to wait until the sprint race in Hungary for his next points.[39] He followed that up with an inconsistent end to the season, which included points finishes in Zandvoort and Monza, but also a pair of retirements, after which he stated that his results masked the underlying pace him and the team had.[40] Saucy ended his season 15th in the standings, finishing behind his teammates Martins and Correa.[41]
In November 2022 ART Grand Prix announced Saucy would remain with the team for the 2023 season, where he would partner Kaylen Frederick and Nikola Tsolov.[42] Qualifying third for the Bahrain round,[43] he began the season with fourth in the feature race, and then improved to qualify on the front row in Melbourne.[44] He would then convert it into his first podium of the year, remaining in second and marking him as a title contender.[45][46] Another podium followed in the Monaco sprint race, despite been penalised from reverse pole.[47][48] However, he suffered similar fortunes to the year before, only securing three more points finishes throughout the season. This was interrupted with a pole position in Austria,[49] but was unable to capitalise after sustaining a puncture in the battle for the lead.[50] His season, being plagued by numerous unlucky incidents, saw Saucy only 14th in the standings with 54 points, albeit the highest placed ART driver.[51]
That year, Saucy also teamed up with prototype stalwart Mathias Beche and bronze-ranked Rodrigo Sales in the LMP2 Pro-Am class of the European Le Mans Series with Richard Mille by TDS.[59] Following a Pro-Am podium at the season-opener in Barcelona, Saucy and his teammates would go on to win at Le Castellet.[60][61] He secured pole for the Spa-Francorchamps but retired after making a mistake following a safety car restart.[62] He then won once again during the 4 Hours of Mugello.[63] Overall, it was a very successful season for Saucy and the team as they placed fourth in the LMP2 standings.
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