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On the ATP Tour site, in the ranking column, I see a "0" for some players and some weeks. What does this mean?

I am trying to measure the strength of the field of Wimbledon over time, between 2003-2022. In particular, I am looking at Nicholas Kiefer's ranking in 2007, where he has a ranking before 2007-06-04 and after 2007-07-09, but zeros for three weeks:

Nicolas Kiefer Ranking History

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It seems to mean he wasn't listed that week.

Here is the list for 2007-07-09, where he's ranked #413, and here the list for 2007-07-02, where he doesn't appear. (BTW, it's easier to change the URL than to find the right week in the dropdown.)

Why he wasn't listed that week is another good question...

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  • I think it's because he hadn't played a match for over a year; from Wikipedia: "Kiefer injured his wrist while playing at the 2006 French Open, and announced his return on 5 July 2007"
    – Philip Kendall ♦
    Commented Aug 1, 2022 at 9:12
  • Ah... Well, it is a 52 week ranking system, so if the player is inactive for longer, it makes sense that they would fall out of the system. Thank you.
    – J.J.
    Commented Aug 1, 2022 at 22:28

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