Keys, the No. 19 seed and a two-time semifinalist at Melbourne Park, had won the first set. But Rybakina, who like Keys is a precise winner machine when she is playing the tennis she wants to play, had taken the second by seizing the initiative and playing on her front foot. Halfway to the finish, Keys had become a passive counterpuncher.

Coco Gauff’s retooled forehand and serve abandoned her in the worst way and at the worst time at the Australian Open.

Novak Djokovic has come back to defeat Carlos Alcaraz 4-6, 6-4, 6-3, 6-4 to reach the Australian Open semifinals for the 12th time.

Follow live updates as Carlos Alcaraz takes on ten-time Australian Open champion Novak Djokovic in the quarter-finals at Melbourne Novak Djokovic and Carlos Alcaraz will clash today in a blockbuster Australian Open quarter-final in Melbourne.