Feller began karting in 2011, competing in the Supermini class of the Switzerland-based Bridgestone Cup.[2] The following year, he expanded his karting program, taking second overall in the Supermini class of the 2012 Swiss Karting Championship. In 2016, at the age of 15, Feller stepped into single-seater formula cars for the first time in his career, joining Mücke Motorsport (branded as ADAC Berlin-Brandenburg) for the 2016 ADAC Formula 4 Championship season.[3]
After competing with Mücke Motorsport during the 2020 season, Feller returned to Land Motorsport for the 2021 ADAC GT Masters season.[10] Reunited with co-driver Mies, the two claimed three race victories en route to the overall championship, with Feller also taking the Junior categorization title as well.[11] With Emil Frey Racing, Feller scored the 2021 GT World Challenge Europe Endurance Cup Silver class title, driving alongside Alex Fontana and Rolf Ineichen.[12] The trio scored two class victories and three podiums from five races en route to their title.
For 2022, Feller joined Audi Sport's factory roster, taking part in the DTM with Team Abt Sportsline.[13] He had reportedly received multiple offers ahead of the 2022 season,[14] but elected to sign a factory contract with Audi. At Imola in June, he claimed his first career DTM pole.[15] He would go on to win that race, in the process scoring his first series victory.[16] Feller would score one additional podium in 2022, finishing 15th in the championship. Following his rookie season, Feller stated he was pleased with the year, and believed that the team had potential in the near future to challenge more frequently for race victories.[17] Outside of his DTM commitments, Feller competed part-time in the ADAC GT Masters, driving for Land-Motorsport alongside Jusuf Owega when DTM and GT Masters dates didn't clash.[18] His Audi factory driver duties also saw him take part in several one-off endurance events, including the Bathurst 12 Hour with The Bend Motorsport Park Team Valvoline,[19] the 24 Hours of Spa with Attempto Racing,[20] and the 24 Hours of Nürburgring with Team Phoenix.[21] For the final round of the 2022 GT World Challenge Europe Endurance Cup, he deputized for Team WRT's Kelvin van der Linde, who was unwell.[22]
Feller began his 2023 campaign at the Bathurst 12 Hour,[23] finishing second in the Pro-Am class where he shared his Audi with Yasser Shahin and Christopher Mies. He returned to his factory driver duties at the Kyalami 9 Hours, where he finished third overall alongside co-drivers Mattia Drudi and Patric Niederhauser.[24] His partnership with Drudi continued throughout the 2023 season, where the two shared Tresor Orange1's Audi for the full GT World Challenge Europe campaign. Fellow factory driver Dennis Marschall joined the entry for the Endurance Cup.[25] In Sprint Cup competition, Feller and Drudi claimed four race victories, including a sweep of the season finale weekend at Zandvoort, claiming the overall title by 19 points over Raffaele Marciello and Timur Boguslavskiy.[26] The Endurance Cup saw Feller claim one podium finish, finishing fifth in the championship. In late February, Feller's return to DTM for a second season was confirmed, where he would again drive for Abt Sportsline.[27] Feller claimed a single race victory,[28] adding two further podium finishes en route to a third-place championship finish.
In 2024, Feller formed part of the Scherer Sport PHX team that won the shortest Nürburgring 24H in history, after over half of the race was red-flagged due to fog.[29]
^"ADAC GT Masters News Notebook". dailysportscar.com. 18 April 2017. Retrieved 22 October 2021. Swedish driver Mikaela Åhlin-Kottulinsky completed her first full-season in the ADAC GT Masters season in 2016. 18-year-old Ricardo Feller from Switzerland will be her new teammate.
^Kilshaw, Jake (20 June 2018). "Silver Cup Field Grows as Blancpain GT Heads to Misano". sportscar365.com. John Dagys Media. Retrieved 22 October 2021. Adrien de Leener and Ricardo Feller will drive the car with de Leener making his return to the team and Feller set for his series debut.
^Dagys, John (14 December 2018). "Land Confirms Rolex 24 Lineup". sportscar365.com. John Dagys Media. Retrieved 22 October 2021.
^"Iron Lynx Ferrari Squad Clinch Endurance Cup Drivers Title". dailysportscar.com. 10 October 2021. Retrieved 22 October 2021. There were further Endurance Cup successes today for Ferrari squad Sky Tempesta Racing and its driver Chris Froggatt, while Emil Frey Racing survived an early puncture to seal the Silver Cup with its #14 Lamborghini crew of Ricardo Feller, Alex Fontana and Rolf Ineichen.
^Dagys, John (25 February 2023). "WRT BMWs Take Controlling 1-2 Result in Kyalami 9H". Sportscar365. John Dagys Media. Retrieved 25 February 2023. Feller, Mattia Drudi and Patric Niederhauser completed the podium in their Audi...
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