Jannik Sinner’s farewell came as a video message, and it opened in the voice of the kid he had once been.

“Darren, when we started working together in 2022, I was just a skinny Italian kid with so many questions.”

He closed on the line that framed the whole goodbye.

“Five seasons. I won’t forget a single day of them. Thank you, friend, for everything.”

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Between those two lines, Sinner told Darren Cahill he had grown into much more than a coach, into someone to trust and lean on as a friend, and said the trophies were not what he would remember most. The Italian and his Australian coach confirmed on Friday that they will end their collaboration at the close of the 2026 season.

Cahill joined the team in June 2022. He leaves after a run that brought five Grand Slam titles, two ATP Finals crowns and a Career Golden Masters, with Sinner first topping the rankings in June 2024.

Magnus Norman, a former world No. 2 from Sweden, will join the coaching team at the start of December, working alongside Simone Vagnozzi. Vagnozzi has been in Sinner’s corner throughout the Cahill period and carries over into the new setup.

Cahill, in the same official announcement, called his time with the 25-year-old “an honor and a special privilege” and described Sinner as a humble, hard-working champion. He added that he wished the team nothing but continued success. Cahill’s remarks appeared in Italian; the quotes are translated.

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Sinner goes into the handover from an unusual place. He has not played a competitive match since retaining his Wimbledon title in July, sidelined by a knee injury that forced him to end his season early. He dropped to world No. 2 this week.

He will miss the Nitto ATP Finals in Turin. His comeback is scheduled for the end of December at the Six Kings Slam exhibition in Riyadh, by which point Norman will already be inside the setup.

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