Originally Posted by tennisfreak13
Why 70 and not 140?
Look at here at her ranking breakdown: http://www.tennisforum.com/showthread.php?t=455441
She will get 470 points for winning Paris 2013 => Montreal (70 points) will become a non-countable result => +400 points for the rankings.
Points from Paris 2012 (140 points) will drop off => Montreal will become a countable result again => -70 points for the rankings.