LONDON—Grigor Dimitrov is no longer working with Franco Davin, with the Bulgarian saying the two stopped a week before Wimbledon.

"I'm not trying to hide it, obviously,” Dimitrov said following his third-round defeat to Steve Johnson. “Things just haven't worked out good for us.”

The 25-year-old, who has had several coaches during his career and began working with Davin almost a year ago, has not named a new coach.

"I mean, I know how to play tennis in the same time," he said. "I just have to do a little bit extra work on my own with the racquets, with the stringing, the balls, the courts, the practice. Other than that, you know, I'm pretty comfortable right now, and happy."

Davin is the former coach of Juan Martin del Potro.

Going into Wimbledon, Dimitrov had not won a match since his racquet-smashing display in Istanbul final. Despite turning around his form at the event, he still wants to rebuild his team.

"Obviously if they're not around, it's for me to obviously find something else, something new, something that would get me back on the right track,” he said. “I mean, I want to improve.”

Dimitrov is No. 37 in the rankings.