Marc Marquez secured his second world championship, and first in the Moto2 class, with a third place finish in Sunday's penultimate event at Philip Island, Australia.
The 19-year-old Spaniard - who missed much of winter testing due to double vision problems following last October's Sepang fall - has dominated his second season in the 600cc class, winning a record eight races and finishing on the podium 13 times from 17 rounds.
The 2010 125cc world champion simply needed to be 14th or higher at Phillip Island, regardless of rival Pol Espargaro's results, to be crowned before the Valencia finale.
Espargaro duly disappeared into the distance to win his fourth race of the year by a huge 16.8s, while Marquez spent most of the race shadowing Scott Redding for second.
Home star Anthony West then caught the pair and snatched second place from Redding at the hairpin on the last lap. Marquez then blasted past Redding into the final turn to ensure he could celebrate his title from the podium.
Marquez, who has spent both his Moto2 seasons with the Catalunya Caixa Repsol Suter team, will move to MotoGP next season to ride alongside Dani Pedrosa at Repsol Honda.
Marquez will make his MotoGP debut at the Valencia post-race test on November 13-14.
Espargaro is remaining in Moto2 for 2013, with the Pons Kalex team.