WBO super-middleweight champion Billy Joe Saunders has split with promoter Frank Warren.
The 29-year-old southpaw from Hertfordshire turned professional under the guidance of Warren's Queensberry Promotions in 2008 and remains undefeated, but he has so far failed to land big fights with the likes of Canelo Alvarez and Gennady Golovkin.
Warren said: "I've really enjoyed working with Billy Joe through his whole professional career and guiding him to become British, Commonwealth, European and a two-weight world champion.
"I'm personally very fond of Billy Joe and I wish him every success in the remainder of his career."
Saunders added: "I just want to say a massive thank you to Frank for everything he has done for my career over the past decade.
"It feels a little bittersweet and I'll always be appreciative for everything Frank has done for me. We'll stay close."
