We've updated the calendar corresponding to the 2013 ATP calendar.
There will be new tournaments in Dusseldorf and Bogota, while Belgrade was removed. Also, the draw size from a couple of tournaments has changed (from 32 to 28, or 28 to 32 etc).
The new tournaments will be inserted in week 26 of a season, so if your gameworld is now in week 26 or later, the next year will still use the old calendar.
In the first year of the new calendar there may be issues in week 7/8 because the team cup was moved. In the first week, the team cup will therefore be in the wrong week.