The MX1 crown may already be decided in Antonio Cairoli's favour, but the 2009 MX2 Motocross World Championship will be settled during this weekend's final round in Brazil.

What is known is that it will be won by a Red Bull KTM rider, with Marvin Musquin starting the weekend with a valuable 22 point lead over team-mate Rui Goncalves, with 50 points up for grabs.

Both are chasing their first ever world title, but for Goncalves it will also be his last shot at the MX2 crown - he will move to MX1 in 2010 when the MX2 maximum age limit will be 23.

The pair start the final round with Musquin having won eleven of the 28 motos so far this season, which he began on an NGS Honda before switching to KTM - a move that forced him to sit out the Swedish round due to legal issues - while Goncalves has taken six moto victories.

Third placed Gautier Paulin of Bud Kawasaki is an insurmountable 68 points from fellow Frenchman Musquin, but 35 points clear of Davide Guarneri, and therefore on target to claim third in the end of season ranking.

In the MX1 class, Max Nagl will be looking to wrap up second in the championship behind his 2010 KTM team-mate Cairoli.

The German will start the weekend 24 points clear of third placed outgoing champion Davide Philippaerts (Monster Yamaha) who is just two points ahead of Clemet Desalle (LS Honda) and four points in front of his 2010 team-mate Ken de Dycker (Teka Suzuki).

Sixth placed Josh Coppins, 38 points behind Nagl, still has a mathematical chance of second and will certainly not slip lower than his current ranking with Cairoli's Red Bull Yamaha team-mate Tanel Leok 67 points behind the Kiwi in seventh.