World No 4 Iga Swiatek on Thursday announced that she was working with Francisco Roig, who used to coach Rafael Nadal.
"Welcome to the team, Francisco! Very excited for this new chapter," the 24-year-old Pole wrote on Instagram.
The news came less than two weeks after the six-time Grand Slam winner announced that she had parted ways with previous coach Wim Fissette following her second-round exit at the Miami Open.
It was the former world No 1's earliest exit at a tournament since the Cincinnati Open in August 2021.
She has been in patchy form this year, losing in the quarterfinals at the Australian Open, the Doha Open and Indian Wells.
Roig, 58, spent many years working alongside Nadal's uncle Toni Nadal and then Carlos Moya as part of the Spanish clay court great's team.
He has previously coached Britain's Emma Raducanu, Italian Matteo Berrettini and Frenchman Giovanni Mpetshi Perricard.