What changed
Darren Cahill will leave Jannik Sinner’s coaching team at the end of 2026, with Magnus Norman joining next season. Cahill, who joined Sinner in June 2022, helped him win five Grand Slam titles and spend 95 weeks as world number one alongside Simone Vagnozzi.
Why it matters
This is a major change for a player whose rise has been tightly linked to that coaching partnership. Sinner was outside the world’s top 10 when Cahill arrived and had never reached a Grand Slam semi-final; now the team must manage a handover while Sinner returns from injury and adjusts to losing the ranking lead to Alexander Zverev.
Sinner is due back at the Six Kings Slam in Saudi Arabia next month, after last playing in July, when he won Wimbledon for the second year in a row. Norman brings experience from his long stint coaching Stan Wawrinka, but the practical split of responsibilities next season remains unclear.
The simplest reading is that Sinner’s success has created a new test: can the methods that took him to the top survive a change in one of the voices that helped build them?
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