I have noticed that occasionally some players enter tournament via wild card, despite the fact that they have sufficient ranking for direct entry into tournament, sometimes even to be seeded. To list a few examples:
- The top seed of 2017 Acapulco Novak Djokovic.
- The top seed of 2017 Barcelona Open Andy Murray.
- The top seed and winner of 2016 Moscow Svetlana Kuznetsova.
- My impression is that this happens more often at challenger level, for example Martin Kližan at 2016 Poprad-Tatry or Denis Kudla at 2016 Savannah.
Why do players with high ranking actually need wild card? Is it only in cases of late entry?