A powerful serve from Jannik Sinner put the net at Melbourne's Rod Laver Arena to the test. In the fourth set, with the South Tyrolean player trailing 1-0 (but leading two sets to one), the

World no. 1 Jannik Sinner has survived a mid-match health scare to keep his title defence alive at Melbourne Park. Jannik Sinner looked sick and sorry, with his Australian Open title defence under siege.

First came the medical timeouts, one each for Jannik Sinner and Holger Rune with the temperature above 90 degrees Fahrenheit (32 Celsius) at the Australian Open. Then came the unusual sight of a 20-minute delay because the net at Rod Laver Arena detached from the court after being hit by a big Sinner serve.