Hi, 
1) I don't think there is a way to connect pitches to a general "sports centre"

2) Maybe "Haapsalu Padel" could be a sport_centre, like here

https://www.openstreetmap.org/way/1076116358

There is probably more than some pitches, maybe gear/changing rooms/toilets.

3) In this case, individual pitches' names should be left blank since they don't really identify them
