Chief wrote this on an old post asking about getting the club in the map:
... at Villa Amarilla, did you go into Anita's room? It's at the end of the corridor if you go up the left stairs in the entry hall.
In the bathroom, find Anita's organizer and open it to read the message to get the Tennis Club phone number. Nick will say something.
....Nick must also recharge his cell phone.
There is also a brochure about the tennis club.
See if that helps. If not let's wait for someone that played the game to help us.
Or you can replay from an old saved game and follow the wt to see if that loosens the stumper.