Originally Posted by timnz
ATP ranking is derived from points accumulated over the last 52 weeks. ATP RACE ranking is derived from points earned since 01-JAN this year. Obviously on the 31st of December these two ranking systems exactly match (because the 52 weeks before the 31st of December was the 01-JAN).
Wow... I simply didn't think that those 2 rankings match at the end of the year... and well it's just obvious !!
Thank you for that answer