41.   Koivu twisted the knee while trying to avoid a check from Eric Lacroix in the neutral zone.

42.   Last week former French Open champion Yevgeny Kafelnikov withdrew after twisting his knee in the Doha tournament in Qatar.

43.   Mitchell got hurt when two defenders grabbed him on his final pass attempt, twisting the knee.

44.   On the final point of the seventh game of the fourth set, Graf twisted her knee.

45.   Sergi Bruguera, the two-time French Open champion, twisted his knee in a match against Alexander Volkov late Wednesday and flew home to Barcelona Thursday.

46.   Sergi Bruguera, the two-time French Open champion, twisted his knee in a match against Volkov late Wednesday and flew home to Barcelona Thursday.

47.   Swann had never been injured, but he twisted a knee at his first NFL minicamp and had his first arthroscopic surgery that summer.

48.   The longest delay occurred when American Kyle Rasmussen twisted his knee and tumbled off course.

49.   The summit was pushed back after Clinton twisted his knee Friday and underwent surgery to repair a torn tendon.

50.   Third seeded Sergi Bruguera of Spain also was forced to withdraw when he slipped and fell and apparently twisted his knee.