Hi and thanks for your reply!

The wiki says '*some physical outline of the pitch or* painted line markings'. Besides, the corresponding Wikipedia article states: 'The field of play generally includes out-of-bounds areas that a player is likely to enter while playing a match [...]'.

But i think we should discuss this with more people (if it hasn't already done) - on the Swiss mailing list and/or on the tagging mailing list.

> I would like to take the topic of tennis even further and consider drawing an area with leisure=sports_centre around the individual pitches.

If i'm not mistaken, a sports centre is a facility where several sports are practiced. A tennis facility isn't a sports centre. But it may make sense to create a new tag for (named) sport facilities.

Regards
Raphael