Swiss tennis player Stan Wawrinka announced the beginning of a joint work with former mentor Andy Murray, Tomas Berdych and Grigor Dimitrov, Venezuelan Dani Vallverdu.
“I am pleased to announce that during the grass season I will train under the guidance of Dani Vallverdu. He has a lot of experience,” Wawrinka wrote on his Twitter account.
Recommended article: Jo-Wilfried Tsonga: I have no goals for the grass season
