The younger brother of reigning MotoGP™ World Champion Marc Marquez, Alex Marquez began his path to the world stage in 2010 when he joined Team Competition Monlau 125 in the FIM CEV Repsol. He did not participate in the first race of the Championship, as he was five days below the minimum age to compete. Yet in the second race, held at Albacete, he achieved 11th place. That year he finished 11th in the final standings with 24 points. In 2011 he then came very close finishing the season top, but just missed out to older rival Alex Rins. 2012 proved to be his year, as he won the Moto3™ CEV title, and took part in numerous wildcard rides in the Moto3™ World Championship including an incredible performance at the Catalan GP. For the 2013 season he stepped up full time with the Estrella Galicia 0,0 team and secured his first victory at Motegi, coming fourth overall. In 2014, Marquez won more races and took more podiums on the way to taking the Moto3™ World Championship.

Marquez then moved up to Moto2™ with the EG0,0 Marc VDS team for 2015 and had a tough rookie year with two top four finishes, looking to expand on the potential he showed the following year as rider and team remained together in 2016. He started the season with an arm injury, but then took his first podium finish with a stunning ride at MotorLand Aragon to come home P2 after a last corner duel. Taking his first intermediate class win after proving unstoppable on home turf at Jerez, Marquez followed it up with another win at home in the Catalan GP. Then injured mid-season and taking some time to recover fully, the rider from Cervera was unable to fight for the title but took fourth overall, after another victory at Motegi in a tactical masterpiece. In 2018, Marquez was able to claim six podium finishes, but he went the year without a win. Remaining with the team for another year, 2019 saw Marquez step up to the plate. Five victories and another five podiums saw him claim his second World Championship with a race to spare, and following Jorge Lorenzo’s retirement from MotoGP™, the then Moto2™ World Champion stepped into the Repsol Honda colours to partner his brother Marc for 2020.

While it was a year to forget for the older Marquez brother, Alex made hay as he claimed back-to-back second places in the French and Aragon GPs. He narrowly missed out on the Rookie of the Year award, coming 14th overall in his maiden year. 2021 saw him remain with Honda, but in the LCR Honda Castrol ranks under the guidance of Lucio Cecchinello. A struggling Honda package saw Marquez struggle to find any real form, but P4 at the Algarve GP was a reminder of the speed Marquez possesses. Staying with LCR in 2022, a brand-new HRC bike couldn't deliver an upturn in results as Marquez failed to break into the top six all year. 2023 saw the Spaniard jump on Bagnaia's Championship-winning GP22 as he replaced Bastianini at Gresini Racing. Two Sunday podiums arrived, the best of which came in Malaysia with a P2, while a Sprint win was claimed at Silverstone. A second season with Gresini Ducati awaits in 2024, with wins the obvious objective. Marquez also welcomes his older brother Marc to the team too, a fantastic challenge for the #73.