Grigor Dimitrov and his longtime coach Daniel Vallverdú have concluded their eight-year collaboration. This coaching change adds to the recent shifts on the ATP Tour, coming shortly after Alcaraz and Ferrero's separation.

Their partnership unfolded in two phases: initially starting in July 2016, pausing in May 2019, and then resuming in December 2022 until officially ending in 2025. Dimitrov expressed gratitude on social media, highlighting the significance of their eight years together and thanking Vallverdú for his trust and motivation; Vallverdú also responded with well wishes and reflected on their valuable time working together.
This collaboration witnessed Dimitrov's ups and downs. When they first teamed up in 2016, he was ranked only 40th. The following year, he captured the Cincinnati Masters ATP1000 title and the ATP Finals championship, reached the Australian Open semifinals, and finished the year ranked a career-high No. 3. However, his form declined in 2018-2019, with only one runner-up finish, leading to their initial split. After resuming their partnership at the end of 2022, Dimitrov rebounded in 2024 by winning the Brisbane International and finishing runner-up in three tournaments, returning to the top 10 rankings.
The 2025 season became the turning point ending their cooperation. Dimitrov failed to reach any finals all year, missed several events due to a chest muscle injury at Wimbledon, parted ways with another longtime coach Delgado in September, and after returning at the Paris Masters, withdrew because of a shoulder injury. His year-end ranking dropped to 44th, culminating in the end of their eight-year partnership.
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