British No 1 Laura Robson has split with coach Miles Maclagan after just four months working together.
Robson has won just three matches in her last four tournaments and is now on the lookout for her third coach of the year.
She parted with Croatian coach Zeljko Krajan just before the grass-court season after nine months together.
She reached the last 16 of Wimbledon and third round of the US Open but has only reached the last eight in one of her last 22 tournaments.
Robson posted on her Facebook page: "Bit of news.. Miles and I have decided not to continue our partnership.
"I want to thank Miles for stepping in on quick notice to be my coach this summer.
"I have great respect for him and a person and coach and look forward to continuing our friendship.
"I will take a couple weeks off to refresh my mind and body and will keep my fans updated on my coaching situation."