Britain's Jamie Murray will end his doubles partnership with American Eric Butorac after the US Open and is looking for a top-class replacement.
Murray and Butorac have won three tournaments this year
Murray and Butorac are ranked 13th in the ATP doubles race, which covers performances in the calendar year.
And Murray's agent Patricio Apey says while the split is amicable, the Scot is keen for a high-quality new partner.
"True champions make these decisions when they are at the top of the game rather than the bottom," said Apey.
"They've had some good open discussions and decided it was best to go on without each other. They have learned a lot together but it is time to move on."
Apey added: "It is in the Murray genes to always strive for the best.
"When Andy split with his coach Mark Petchey, he put the world's best coaches on the list of possible replacements, and I see the same trait in Jamie.
"He has a lot of fire in his belly and he strives for the very best. Other players know they will have a great future if they link up with Jamie."
Murray and Butorac revealed their imminent split in a statement on their website on Wednesday.
It read: "Booty and Stretch will be no more after the US Open. We will be heading our separate ways."
Murray and Butorac have won three titles so far this year in Memphis, Nottingham and San Jose.
Since Memphis in February the pair have only once been past the quarter-finals of a tournament, winning the title on grass in Nottingham in June.
The 21-year-old, elder brother of British number one Andy, also won the Wimbledon mixed doubles title with Jelena Jankovic and is part of the Great Britain Davis Cup team.