Arenas began his competitive motorsport journey in 2013, finishing 18th in the European Junior Cup on a Honda CBR500R. He spent two seasons in the FIM CEV Moto3 Junior World Championship, claiming the runner-up position in 2015, which marked him as a promising talent ready for the world stage.
Arenas made his Moto3 World Championship debut at the final round of the 2014 season in Valencia, drafted in by Calvo Team as a replacement for the injured Eric Granado. He spent the years that followed building experience across different teams, including stints with Peugeot MC Saxoprint and Aspar Team. During his time with Aspar in 2016, he made two wild-card appearances and also substituted for injured teammate Jorge Martín.
His championship breakthrough came in the 2020 season. Despite a truncated and disrupted calendar caused by the global pandemic, Arenas delivered a composed campaign, scoring three race wins and five podiums to accumulate 174 points. He edged out Tony Arbolino and Ai Ogura by just four points in one of the tightest Moto3 title battles in recent memory, clinching the world title and his place in the record books as the class's oldest champion.
Following his Moto3 title, Arenas stepped up to the intermediate class with Aspar's Moto2 squad for the 2021 season. The transition proved challenging; adapting to the heavier and more powerful machinery, he scored only 28 points across 18 races to finish 21st in the standings. His second year with Aspar in 2022 showed improvement, netting 90 points and a best result of fourth place at the Rimini round.
For 2023, Arenas earned a coveted seat at the Red Bull KTM Ajo team, one of Moto2's most successful operations. He finished the season 14th overall with 85 points, and secured his first intermediate-class podium with a third-place finish in Catalonia. His teammate Pedro Acosta claimed the championship that year by a commanding 83-point margin.
Arenas moved to Gresini Racing Moto2 for the 2024 season, partnering Manuel González, before spending the 2025 campaign with the same Gresini operation. He competed in the 2025 Moto2 season before announcing a transition to the Supersport World Championship for 2026 with the AS Racing Team aboard a Yamaha.
Albert Arenas represents the depth of Spanish motorcycle racing talent that has dominated the junior Grand Prix classes in the 2010s and 2020s. His 2020 Moto3 title stands as a testament to consistency and racecraft under extraordinary circumstances. Though his Moto2 career yielded modest results compared to his world championship pedigree, his ability to adapt across machinery and teams across a decade of Grand Prix competition reflects the breadth of his professional resilience.
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