Novak Djokovic and Andy Murray will continue their partnership "indefinitely".
Murray started working with Djokovic as part of his coaching team during the Australian Open, which the Serbian withdrew from at the semi-final stage due to injury.
Djokovic said at the time that he and Murray would "cool off" before deciding if the partnership was worthwhile, and now the 24-time major winner has welcomed the Scot back into the fold.
"I expressed my desire to continue the collaboration with him so I am really glad he did accept," Djokovic said.
"It's indefinite in terms of how long we are going to work together but we agreed we are going to work most likely in the [United] States and then some clay-court tournaments and see how it goes after that."
He added: "It was exciting for the whole tennis world and also for us to be in different roles together on the same side of the net.
"He has a unique perspective on my game - he has played me, he has played all the current best players in the world in my opponents."
