By Reuters Staff 2 Min Read MELBOURNE (Reuters) - World number one Novak Djokovic skipped practice on Saturday after suffering what he described as a “muscle tear” as the wait continued over the defending Australian Open champion’s ability to contest his fourth round match. Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 13, 2021 Serbia's Novak Djokovic celebrates after winning his third round match against Taylor Fritz of the U.S. REUTERS/Loren Elliott The 33-year-old, a record eight-time winner on the Melbourne Park Arena, slipped during the third set of Friday’s third-round match against Taylor Fritz and disappeared off Rod Laver Arena for treatment.