Stan Wawrinka grateful for Roger Federer's 'help and support' as he plays Diriyah Tennis Cup ahead of Australian Open

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Stan Wawrinka grateful for Roger Federer's 'help and support' as he plays Diriyah Tennis Cup ahead of Australian Open

"Roger Federer and Stan Wawrinka enjoyed plenty of success together, winning doubles gold for Switzerland at the 2008 Olympics and also the Davis Cup in 2014. Wawrinka, 37, has also said he is grateful for the support he received during his career from 20-time Grand Slam champion Federer, who retired in September at the Laver Cup. Wawrinka is playing the Diriyah Tennis Cup this week."