Only a victory at Toronto this weekend will prevent IndyCar Champion Dario Franchitti from losing ground in the Castrol Rankings.
The Scot started from pole at Toronto last year and led more than half the race on his way to a dominant victory. Because of that, he is defending a near-perfect score from the 2009 event. Failure to repeat his win could result in him falling from his current seventh place.
Should his Target Chip Ganassi teammate Scott Dixon (10) and Team Penske's Ryan Briscoe (9) win, it could push him to the tail end of the top 10.
One man that should benefit hugely is Helio Castroneves (25), who only needs to make the finish to boost his score, and who could climb into the top 20 with a victory.
The Algarve Le Mans Series race will give ORECA Peugeot drivers Stephane Sarrazin (196) and Olivier Panis (191) the chance to make up ground, too.
Things look more difficult for last year's winners Jean-Christophe Boullion (XX) and Christophe Tinseau (711) though. While Boullion at least has a chance to repeat his victory for the Rebellion Lola squad, Tinseau is not racing.
Having fallen over 400 places since June, the Frenchman will drop outside the top 1,200 come next week.
To see the full Castrol Rankings, go to www.castroldriverrankings.com