Marquez brothers make MotoGP history in Valencia November 9, 2014 -- Updated 2058 GMT (0458 HKT) Alex and Marc Marquez (right) celebrate their double triumph in the final round of the MotoGP season in Valencia. Marc Marquez wins season-ending MotoGP race in Valencia Sets new record of 13 victories in a season Younger brother Alex wraps up Moto3 title First brothers to hold motorcycle world titles at same time (CNN) -- The Marquez brothers Marc and Alex made motorcycling history Sunday with a double triumph in the final round of the season in Valencia. Marc, who had already wrapped up a second straight MotoGP crown, set a new record for wins in a season with his 13th, while his 18-year-old younger brother clinched the Moto3 crown. It means they are the only brothers to hold titles in the same season and it can only be a matter of time before they are direct rivals in the top echelon of the sport. Read: Marquez ties Doohan's record Alex, who will be promoted to the Moto2 class next season, finished third in the final race, enough to hold off Australian Jack Miller, who won in Valencia, by just two points. He then watched as Marc overcame tricky conditions to round off another triumphant season on his Repsol Honda with an emphatic victory. He started from fifth on the grid after a crash in qualifying Saturday, but quickly worked his way through the field. Marquez eventually took the lead on the 11th lap and had opened up a near four-second advantage by the time he took the checkered flag from Italian legend Valentino Rossi, who clinched second in the title race. Read: Rossi wins after Marquez crashes out Marquez's teammate Daniel Pedrosa took the final spot on the podium, while Andrea Dovizioso held off his Ducati teammate Cal Crutchlow for fourth. Marquez, who tied Mick Doohan's 1997 record of 12 runs in the previous round in Malaysia, said he had been inspired by his brother's earlier triumph. The truth is I am very, very happy. During the race at times I was thinking of my brother and thought I had to do well," he admitted. The 18-round season has proved an all-Spanish affair at the top of all the categories, with Esteve Rabat having already clinched the Moto2 crown.