US Open Tennis ranking points
When the final match is delayed for some reason, or not played until the next day (Monday) - the new rankings will be delayed also and not published until the winners of the tournament final(s) are determined.
Since the Men's US Open final has been played on Monday the past 4 years now - let's use that tournament as an example. This year (2014), the tournament started on Monday Aug 25th and the Men's final was played on Monday, Sep 8th, with Marin Cilic winning the title - which comes along with 2, 000 rankings points for being the champion.
So, even though the Men's US Open final was played on the day representing the rankings for that week, the results were still taken into consideration for that week.
Hope that helps - let me know if you have any other questions.
EDIT: Also, just to clarify something - rankings points earned from playing the tournament the previous year drop off of every players total before the tournament begins, so no players are still carrying around any points from the previous year once the tournament has started. I.E. points earned from a players 2014 US Open result will drop off before they begin playing in the 2015 US Open.
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