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.
"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.