The McLaren MCL34 was a Formula One racing car designed by Pat Fry and constructed by McLaren to compete in the 2019 Formula One World Championship. The car was driven by Carlos Sainz Jr., who joined the team from the Renault Sport F1 Team; and 2018 Formula 2 Championship runner-up Lando Norris. Sainz Jr. and Norris replaced Fernando Alonso and Stoffel Vandoorne, both of whom left the team at the end of the championship. The MCL34 was powered by a Renault engine, the Renault E-Tech 19, and made its début at the 2019 Australian Grand Prix. The car is considered to be a big improvement compared to its disappointing predecessor, the MCL33, often being the best of the rest in qualifying and race trim behind the three leading teams: Mercedes, Ferrari and Red Bull.