At the age of eight, Merhi began his karting career in 1999 , where he was active until 2006. At the end of 2006, Merhi gained his first experience in formula racing at two races in the Spanish Formula 3 championship . The following winter he started in the Italian Formula Renault winter series and came third in the overall standings. In 2007 Merhi started in the Formula Renault 2.0 Eurocup and finished 18th in the overall classification. Things went better for Merhi in the Italian Formula Renault, in which he was also active: With a win at the end of the season, he finished fourth overall. He also took part in races in the Spanish Formula 3, the Italian Formula Renault winter series and the Spanish GT Championship. In 2008 Merhi moved to Epsilon Euskadi and started both in the Formula Renault 2.0 Eurocup, in which he was fourth overall, and in the Western European Formula Renault, in which he won the runner-up title. In addition, Merhi started five races in Spanish Formula 3, two of which he won.
In 2009 Merhi drove for Manor Motorsport in the Formula 3 Euro Series . After making a strong debut with two second places on the first two race weekends, he achieved two additional podium finishes in the further course of the season. At the end of the season he finished seventh in the overall standings. After Manor Motorsport had withdrawn from the Formula 3 Euro Series at the end of the season, Merhi switched to Mücke Motorsport , for which he competed in the 2010 season. At the Sunday race of the second race weekend in Hockenheim , Merhi achieved his first victory in the Formula 3 Euro Series. At the end of the season he finished fifth overall. He also competed in the GP3 series for ATECH CRS GP from the third race weekend of the 2010 season . After finishing third in the first race on the podium for the first time, at the end of the season he finished sixth overall with two second places as the best results. He was also the only pilot on his team to score points. In 2011 Merhi completed his third season in the Formula 3 Euro Series for the Prema Powerteam as a team-mate of Daniel Juncadella . He won 11 out of 27 races and secured the championship title one race weekend before the end. With 406 to 285 points, he won the duel against Marco Wittmann . In addition, Merhi was eligible for points in the FIA Formula 3 trophy in 2011 . He won this early with four wins from eight races. He also attracted attention at the Formula 3 Masters , in which he collided with Juncadella at the start from pole position.
Merhi at the Formula 3 Euro Series at the Hockenheimring (2009)
Roberto Merhi at the first Formula Renault 3.5 race at the Nürburgring in 2014
In 2012 Merhi decided against further involvement in formula racing , although he had an offer from the GP2 team Racing Engineering . He switched to touring car racing in the DTM . There he was given a cockpit at Persson Motorsport in a DTM AMG Mercedes C-Coupé for the 2012 season . An eleventh place was his best result. He also drove the fastest race lap once. In 2013 , Merhi switched to HWA within the Mercedes DTM team after Persson Motorsport left the DTM. At the season opener he scored his first points in tenth. He finished seventh at the Norisring . At the last race in Hockenheim he achieved his first podium finish with a second place. Merhi had started the race from 21st place and had been given a drive-through penalty for a jump start, but still managed to move forward in rainy conditions. He finished the season in 15th place overall.
In 2014 Merhi returned to formula racing. He was given a cockpit at Zeta Corse in Formula Renault 3.5 . In the first race in Monza he was second on the podium. In Volokolamsk his first pole position and his first victory finally followed. At the Nürburgring he scored another victory starting from pole position and also won a race on the Hungaroring . Merhi had title chances until the last event, but was ultimately defeated by Carlos Sainz jr. and Pierre Gasly and was third overall. Against his teammate Roman Mawlanow he clearly prevailed with 183 to 0 points. In addition, Merhi took part in three Formula 1 free practice sessions for Caterham in 2014 . In addition, Merhi started for Double R Racing in two races of the British Formula 3 Championship in 2014 and won the championship standings in each case. He also finished fourth at the Macau Grand Prix with Double R Racing . As a guest starter , he also competed in a Stock Car Brasil race .
Roberto Merhi at the first Formula 2 race in Spielberg in 2018
At the beginning of 2015 , Merhi received a Formula 1 cockpit for the Manor Marussia F1 Team at short notice. He chose 98 as his Formula 1 starting number. The contract was initially only valid for the season opener, the Australian Grand Prix . Due to technical problems, the racing team did not take part in any meeting. At the second Grand Prix in Malaysia Merhi was used again. He completed his first Formula 1 race and finished in 15th place. He also drove for Manor in the next ten races. He was then replaced by Alexander Rossi for five of the seven remaining races . At the end of the season he finished 19th overall. Merhi was also signed for the 2015 Formula Renault 3.5 season by Pons Racing . The racing team, which has not been so successful in recent years, made great efforts to offer Merhi the cockpit and recruited several sponsors of the Pons Moto2 team for Merhi's commitment during the winter break . Because of an overlap with Formula 1, he did not take part in a race. At the Hungaroring he achieved a podium finish with second place. At the following race weekend in Spielberg , Merhi was involved in an accident after the first race. After crossing the finish line in fourth place, he slowed down. Nicholas Latifi , who had finished several positions behind him, overlooked Merhi and drove into the rear of Merhi's car at high speed. Latifi rose and rolled over. Both drivers were uninjured. The race management saw Merhi as responsible for this accident and disqualified him. In addition, he was banned from the next race for which he had qualified in second place. Merhi ended his involvement in the series after this incident.
In 2017 Merhi replaced Stefano Coletti in Formula 2 for the race weekend in Barcelona at Campos Racing . At the end of the season he still took part in three race weekends in the Rapax team . His best result of the season was fifth. He finished the championship with 16 points in 18th place overall. In 2018 he started again in Formula 2 for MP Motorsport . Before the race in Spa-Francorchamps , his team replaced him with Dorian Boccolacci . For the last two Formula 2 race weekends he started as a replacement for Roy Nissany for Campos Racing. He finished the season in twelfth place.