Kyle Edmund has split from coach Fredrik Rosengren after the Swede announced his retirement from the Tour to spend more time with his family.
Rosengren has helped Edmund reach a career-high ranking and win his first tournament on the ATP Tour since joining the British No. 1's team.
He previously coached Swedish players Robin Soderling and Magnus Norman before joining up with Edmund at the end of 2017.
"Sad to announce Fidde is retiring from the tour," Edmund tweeted.
"You've been an integral part of the team over the last year and a half and together we have reached a top 15 ranking, a Grand Slam semi-final [at the 2018 Australian Open] and won a title in Antwerp in October. I will be forever grateful, enjoy retirement."
Edmund, 24, must now decide whether to seek a replacement or work with only his other coach -- Englishman Mark Hilton.
Edmund -- who peaked at No. 14 in the world rankings in 2018 -- has struggled with a knee injury in 2019, pulling out of tournaments in Marseille and Rotterdam.
He is expected to return to action at a Challenger event in Indian Wells next week.