Every year, the CK committee organises the club championship. During a week, you will battle against other Obvii to see who is the best in playing tennis. You can enroll for every tennis level. Ofcourse you can also enroll for the fundubble. During the fundubble it is not important how good you are at tennis but how much fun you have while being on the court. Also off the courts there will be enough activities, like the anual pubquiz. Enrollment is via toernooi.nl.