Stan Wawrinka began collaboration with Dani Vallverdu
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.
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