The Swiss and the Serb met five times each year between 2009 and 2012, but they have not collided at all this year.
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The former top-10 player rediscovered his appetite for the game when he returned from a controversial bowl ban in Paris.
Despite a disappointing end to his season, the Frenchman can look forward with hope to 2014.
The 2006 Australian Open finalist has traced a turbulent course this year for uncertain reasons.
The Polish rising star broke through exactly one year ago at the indoor Masters 1000 tournament.
Three spots remain at the prestigious year-end championships, and Paris will decide who claims them.
The last Masters 1000 tournament of the season has a history of producing unpredictable champions.
These 500-level events showcased three of the top five men while inflicting less enviable fates on some of their leading challengers.
The 17-time major champion could learn from the words of Rudyard Kipling as he seeks to revive his fortunes.
The former US Open champion, now back in the top 5, poses the greatest threat to the dominance of the Big Four.
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