Spectator wrote:

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Are the differences between actual rankings and the Wimbledon rankings normally this significant? Quite an impact for Djokovic (positive), Federer (positive), Wawrinka (negative), Müller (positive), Sock (negative).

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I'm unable to speak with any authority in response to your question, Spectator - I'll leave that to the more clued-up members of this board - but I've now added this week's rankings after the players' names so that people can see at a glance what you're driving at.

Spectator wrote:

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Are the differences between actual rankings and the Wimbledon rankings normally this significant? Quite an impact for Djokovic (positive), Federer (positive), Wawrinka (negative), Müller (positive), Sock (negative).

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From the Wimbledon web site:

Gentlemen's Seeding Formula

The seeds are the top 32 players on the ATP Ranking list, BUT then rearranged on a surface-based system. Since 2002 a seeding committee has not been required for the Gentlemens Singles following an agreement made with the ATP. The seeding order is determined using an objective and transparent system to reflect more accurately an individual players grass court achievements. It is based on giving additional credit for grass court performance in the two year period immediately before the date used for seeding for The Championships. The formula is:

- Take the ATP Ranking points at 26 June 2017
- Add 100% of the points earned for all grass court tournaments in the immediate past 12 months period prior to 26 June 2017.
- Add 75% of the points earned for the best grass court tournament in the 12 months prior to that.