After taking what Novak Djokovic called "a nasty fall" Wednesday in the final moments of a Wimbledon quarterfinal victory over No. 22 seed Flavio Cobolli, the 38-year-old Serbian star canceled his afternoon practice session Thursday.

As Novak Djokovic chases a record 25th major singles championship, he is more than a decade older than any of his remaining Wimbledon opponents.