Sampras, who has played just once on European clay this season after the recent death of his coach, Tim Gullikson, has a back injury which frustrated his plans for some practice yesterday. Meanwhile, Muster withdrew from the Raiffeisen Grand Prix in Austria yesterday after spraining his ankle while warming up for a match.
Chanda Rubin, the American who is seeded seventh in the women's event at Roland Garros, has withdrawn from the event because of a wrist injury.
n Bjorn Borg, winner of the French Open six times, was recovering at his parents' home in Sweden yesterday after collapsing in a locker-room before a seniors match in the Netherlands at the weekend. Tournament organisers said Borg, 40 next month, had suffered an epileptic fit, but his mother, Margareta Borg, denied this.