Defending champion Jannik Sinner’s consecutive-sets streak has ended in the second round of the Australian Open.

Defending champ Jannik Sinner drops set for first time since October, but rallies for win; American Danielle Collins plays villain while advancing.

Jannik Sinner has announced that he will part ways with his coach Darren Cahill at the end of the season. The Australian, who joined Sinner's team in July 2022, will conclude the 2025 campaign before stepping back from full-time tennis.

But having stunned ninth seed Andrey Rublev in straight sets in the first round, the teenager went down fighting, Italy’s Lorenzo Sonego pulling through 6-7 (6-8), 6-3, 6-1, 3-6, 6-3 to disappoint the vocal Brazilian fans.

Jannik Sinner for the first time since October lost a set as an incredible streak ended at the Australian Open but he still prevailed against the Aussie ace Tristan Schoolkate 4-6, 6-4, 6-1, 6-3 in the second round to quell the potential upset charge.

Jannik Sinner has started his Australian Open title defense with a challenging win over No. 35-ranked Nicolas Jarry.