Daniel Dubois Ends Partnership with Don Charles After Usyk Loss — Tony Sims Steps In

London, England - Daniel Dubois has officially split from trainer Don Charles following his rematch defeat to Oleksandr Usyk, marking a clear turning point in his career as he seeks a fresh start.

The announcement comes after a tumultuous fifth-round stoppage by Usyk, during which Dubois’ chaotic fight preparation—reportedly including a late-arena arrival and distractions involving his father—added to the pressures of the ring. Dubois acknowledged the end of the partnership, expressing gratitude and emphasizing the need for change as he aims to become a two‑time title holder..

Also departing was longtime assistant trainer Kieran Farrell, who had played a pivotal role in Dubois’ rise, including his victories over Anthony Joshua and Filip Hrgović. Farrell paid tribute to the team’s achievements before stepping away.

Leading the next chapter is Tony Sims, a respected coach who guided Anthony Joshua to the IBF title and has worked with high-level fighters like Conor Benn and Ricky Burns. Sims’ appointment marks the start of what Dubois hopes will be a renewed and disciplined campaign.

The changes coincide with managerial shifts, as Sam Jones, formerly Anthony Joshua’s manager, joins as Dubois’ advisor—another signal that the power-puncher is retooling his support structure.

Former teammate and star trainer Paul Smith expressed surprise at the split with Charles, noting their strong rapport and fatherly bond. Yet for Dubois, the move seems rooted in practicality, balancing emotional attachments against the need for strategic evolution.