Carlos Alcaraz eased into the fourth round of the Australian Open for the first time on Saturday after Chinese wildcard Shang Juncheng retired hurt while trailing their uneven contest 6-1, 6-1, 1-0.
In the unusual position of playing someone younger than himself, two-time Grand Slam champion Alcaraz simply dominated 18-year-old Shang for just over an hour on Rod Laver Arena.
Shang, known as "Jerry" at his Florida training base, had taken a medical timeout for treatment on his thigh at 4-1 down in the second set and retired after being broken for the sixth time at the start of the third.