Marc Marquez has his first chance to win the 125cc World Championship in this weekend's penultimate round, at Estoril in Portugal.
Following victory last time in Australia, his ninth of the year, Ajo Derbi rider Marquez has a 12 point lead over nearest rival Nico Terol (Aspar Aprilia), with Pol Espargaro (Tuenti Derbi) 17 points behind.
The following scenarios would give Marquez the world title on Sunday:
* If Marquez wins the race and Espargaro does not finish second and Terol finishes no higher than fifth.
* If Marquez is second and Espargaro finishes no higher than fifth and Terol finishes no higher than ninth.
* If Marquez is third and Espargaro finishes no higher than eighth and Terol finishes no higher than thirteenth.
* If Marquez is fourth and Espargaro finishes no higher than eleventh and Terol fails to score any points.
If Marquez takes the world championship title this year he will become the second youngest world champion in the 62-year history of Grand Prix racing, after 1990 world champion and current MotoGP rider Loris Capirossi.
Marquez' age on the day of the Portuguese Grand Prix will be 17 years 256 days.
The 2010 MotoGP and Moto2 titles have already been decided.