Novak Djokovic elects not to attempt to retrieve an Alexander Zverev forehand as the German forces a tiebreak.

Novak Djokovic dumps a volley into the net on set point, then quits his semi final against Alexander Zverev.

Novak Djokovic dumps a volley into the net on set point, then quits his semi final against Alexander Zverev.

Alexander Zverev hits a shot around the net but it's not enough to win him an epic rally in the first game.

MELBOURNE, Australia (AP) — An injured Novak Djokovic quit after dropping the first set of his Australian Open semifinal against Alexander Zverev on...

Novak Djokovic has sensationally withdrawn from the Australian Open after losing the first set of his semifinal with Alexander Zverev.

Alexander Zverev tells the crowd not to jeer Novak Djokovic in a sporting gesture after the Serbian quit the match.

Alexander Zverev tells the crowd not to jeer Novak Djokovic in a sporting gesture after the Serbian quit the match.

Novak Djokovic faces Alexander Zverev in the semi-finals of the Australian Open on Friday with the Serb’s bid for a record 25th Grand Slam title...

MELBOURNE, Australia (AP) — An injured Novak Djokovic quit because of a torn muscle in his left leg after dropping the first set of his Australian...