Mortara began racing in karts, where he won the 2002 South Garda Winter Cup and 2005 Andrea Margutti Trophy. In 2006, Mortara stepped up to formula racing, driving for Prema Powerteam in both the Formula Renault Eurocup and Formula Renault 2.0 Italia series. He scored on two occasions in the former, finishing 22nd in the drivers' standings, and claimed three podiums in the latter to finish fourth overall.
In 2007, Mortara joined Signature-Plus in the Formula 3 Euro Series. He scored his maiden car racing victory during round two at Brands Hatch. Mortara returned to Signature for his sophomore season in 2008, where he narrowly beat Jules Bianchi to second in the championship. He also took part in the 2008 Macau Grand Prix, where he won the qualification race.
Mortara contested the latter four events of the GP2 Asia Series at the start of 2009, scoring a podium on his debut in Bahrain. He then joined Arden International in the 2009 GP2 Series, winning the first sprint race of the year at Barcelona. At the end of 2009, Mortara returned to Formula Three to race at the Macau Grand Prix with Signature, winning the main race. Mortara returned to the Formula 3 Euro Series in 2010 with Signature, winning seven Saturday races and claiming the championship title. He capped off his junior single-seater career by winning the 2010 Macau Grand Prix, becoming the first driver to win the Macau Grand Prix in successive years during the Formula Three era.
For 2011, Mortara joined Audi Team Rosberg in the Deutsche Tourenwagen Masters. He scored his maiden points with a sixth place at Zandvoort and claimed his first podium in the championship by finishing third at Brands Hatch. Mortara remained with Team Rosberg for the 2012 season, achieving pole position at the Red Bull Ring and his first DTM victory. He scored his second win of the season at Zandvoort. In 2013, Mortara experienced a challenging campaign, finishing 21st in the standings.
Ahead of the 2014 season, Mortara moved to Audi Sport Team Abt. He returned to the podium at Oschersleben with a third place. Mortara's 2015 season started with a fourth and second place at the Hockenheimring. He qualified on pole for race 1 at the Red Bull Ring, which he went on to win. In 2016, Mortara returned for his third season with Team Abt. He started the year by winning the opening race at Hockenheim. Mortara won race 2 at the Nürburgring and took pole for race 1 at the Hungaroring, cruising to a dominant victory. He finished second overall in the championship. At the end of 2016, Mortara left Audi to become a factory driver for Mercedes.
For his first DTM season at Mercedes in 2017, Mortara joined the HWA-run Mercedes-AMG Motorsport BWT team, finishing 14th in the championship. Mortara remained at the HWA-run team in 2018. He took his first DTM victory for Mercedes in race 1 at the Lausitzring. His next win came in race 1 at the Norisring, where Mortara qualified on pole and controlled the race. During his DTM career, Mortara won ten races, scored 26 podiums, five poles, and six fastest laps.
In 2011, Mortara took part in the Macau GT Cup in an Audi R8 LMS GT3, winning in controlling fashion. Mortara returned to the Macau GT Cup in 2012 and won again. In 2013, Mortara claimed another win on the Guia Circuit. At the 2014 edition of the Macau GT race, Mortara claimed pole position in qualifying, finishing third at the checkered flag. In 2015, the race was rebranded as the FIA GT World Cup, where Mortara finished second on the road but was demoted to sixth due to a penalty. At the 2016 GT World Cup, Mortara drove for Team WRT, setting the track record in a GT3 car during qualifying on his way to pole position.
During the 2017 season, Mortara raced in the Blancpain GT Series Endurance Cup for AKKA ASP, finishing third at the 24 Hours of Spa. The 2017 FIA GT World Cup saw Mortara's first attempt at the race behind the wheel of a Mercedes-AMG GT3. Mortara took pole again before winning a chaotic qualification race, leading to his sixth Macau victory. In 2018, Mortara contested the 2018 FIA GT World Cup with Team GruppeM Racing, finishing third overall. For the 2019 edition, Mortara joined Team Craft-Bamboo Racing, recovering to sixth in the final race.
After foreigners were barred from contesting the 2020 and 2021 races, Mortara joined Audi Sport Asia Team Absolute for the 2022 Macau GT Cup, climbing to second place in the main race. In 2023, Mortara took part in several GT3 events, including the 24 Hours of Nürburgring with Mercedes-AMG Team Bilstein by HRT. He then joined Absolute Racing for the final round of the GT World Challenge Asia. To cap off the year, Mortara drove for Audi Sport Asia Team Absolute in Macau, finishing second in the main race.
Ahead of the 2024 season, Mortara joined Lamborghini to become part of the brand's LMDh roster. Alongside Mirko Bortolotti and Daniil Kvyat, Mortara was chosen to pilot the new SC63 in the FIA World Endurance Championship. The team failed to score points until round four, the 24 Hours of Le Mans, where Mortara and his teammates finished tenth overall. Going into 2025, Lamborghini moved its SC63 programme fully to the IMSA SportsCar Championship, where Mortara drove in three events. He, Romain Grosjean, and Kvyat finished fourth at the season-ending Petit Le Mans.
In October 2017, it was announced that Mortara would join the Venturi Racing team for the 2017–18 Formula E season. Mortara took the lead of race 2 in Hong Kong and was promoted to second after the original race winner was disqualified. Mortara returned to the Venturi team for the 2018–19 campaign. He achieved redemption at Hong Kong, being awarded the victory, his first in Formula E.
Mortara began the 2019–20 season by finishing seventh in race 1 at Diriyah. He then narrowly missed out on the podium in race 2, finishing fourth. Going into the 2020–21 season, Mortara returned for a fourth season with Venturi. At race 1 in Diriyah, Mortara finished second. Mortara climbed to first in race 2 at Puebla, holding off Wehrlein to take the victory and the championship lead. Mortara finished the tightly congested championship fight in second overall.
The 2021–22 season ended up being the last for the Gen2 package, with Mortara remaining at Venturi. Race 2 in Diriyah saw Mortara take his third Formula E victory, which allowed him to move into the championship lead. Mortara claimed his maiden Formula E pole position for race 1 in Berlin, leading to victory. At the Marrakesh ePrix, Mortara took victory, as well as the championship lead. Mortara capped off his season strongly by winning race 2 in Seoul, which allowed him to finish third in the standings.
Mortara remained at Venturi, which was rebranded as Maserati MSG Racing, for the 2022–23 season, the first using the new Gen3 chassis. Mortara scored his first points of the year with a ninth place in race 2 at Diriyah. In race 2 at Rome, Mortara climbed from ninth to fourth, earning him his best result of the season. After spending six years with the team, Mortara left Maserati at the end of the season.
Mortara joined Mahindra Racing ahead of the 2023–24 season. Mortara scored his and the team's first points of the season in qualifying for the first Berlin race, claiming pole position. He achieved his best result of the year with a fourth place in Portland's race 1. The 2024–25 season started much more positively for Mortara, who finished fifth in São Paulo. Mortara ended his podium drought at the Jakarta ePrix, climbing to second. Thanks to a penalty, Mortara also finished on the rostrum in race 1 at Berlin, taking third. In 2025–26, Mortara remained at Mahindra for the final season of the Gen3 era.
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