Many did not see the severance of this partnership coming – and certainly not the timing.

The announcement comes little over a month after Alcaraz celebrated finishing as the year-end men’s number one with Ferrero and his team at the ATP Finals.

After losing to his great rival Jannik Sinner in the season-ending Turin final, Alcaraz gave no indication of a potential split, saying he was looking forward to analysing his strengths and weaknesses in the off season before 2026.

However, a documentary released last year did show some signs of tension in their undoubtedly strong relationship, which sometimes felt as much father-son as player-coach.

In the series, Ferrero appeared frustrated with his protege’s application at certain times and questioned his decision to go to Ibiza after winning the French Open in 2024 – against the advice of Ferrero and his agent Molina.

But, after Alcaraz won this year’s US Open in a performance which he described as the best of his career, Ferrero praised the player’s growing maturity.

Alcaraz’s mind has been known to wander during matches, so it was striking how his laser-focused performances in New York helped him find another level.

Ferrero’s constant presence – offering subtle instruction during matches and demanding strict discipline at all times – was key.

But it appears Alcaraz, despite having the finest season of his career, has decided he needs another direction.

The timing is curious, given sources say Ferrero wanted to continue and has not left for personal reasons.

How Alcaraz will evolve without his long-time mentor promises to be one of the most fascinating storylines of 2026.