Novak Djokovic refused to let anything stop his pursuit of a record 25th Grand Slam trophy in the Australian Open quarterfinals. Not a problem with his left leg. Not an early deficit. And not the kid across the net,

Djokovic’s four-set victory over his young rival sets up a semifinal with second-seeded Alexander Zverev and keeps alive his hope of a record 25th Grand Slam title.

In a matchup more appropriate for a final, 10-time Australian Open champion Novak Djokovic prevails in four sets over reigning Wimbledon champ.