TENNIS Isis van den Broek has qualified for the quarter-finals at the National Championships. De Driebergen defeated Charlotte Pikkaart in two sets in the first round: 6-3, 6-2. In addition to Van den Broek, Guy den Ouden (Breukelen), Elgin Khoeblal (Utrecht), Jiske Griffioen (Woerden) and Britt du Pree (Houten) are also participating in the National Championships. (Tuesday December 10)