World number six Elina Svitolina has added Marcos Baghdatis to her coaching team.
Baghdatis, a winner of four ATP Tour singles titles, retired at Wimbledon in July in order to spend more time with his family.
The 34-year-old Greek on Wednesday revealed he will assist Andrew Bettles in coaching WTA Finals runner-up Svitolina.
"I am so glad to announce the next chapter of my life and look forward to coaching a great athlete and super tennis player, No.6 ranked WTA player Elina Svitolina, working alongside Andy Bettles!" he posted on Instagram.
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"I want to thank Elina for putting her trust in me. Let's do this! Bring on 2020."
Former world number three Svitolina failed to win a title this year, but broke new ground at grand slams by reaching the semi-final stage at Wimbledon and the US Open.
Ashleigh Barty denied the 25-year-old from Ukraine back-to-back WTA Finals titles in Shenzhen last month.