Andy Murray will coach his long-time former rival Novak Djokovic at the Australian Open in 2025.
Britain's three-time Grand Slam champion Murray retired from tennis in August after a 19-year career.
The pair will work together in the off-season and in the build-up to the Australian Open, which takes place from 12-26 January.
Former world number one Murray said he was "looking forward to spending time on the same side of the net as Novak for a change".
Djokovic has won the Australian Open a record 10 times, including beating Murray in four finals.