Just over a day after Stan Wawrinka spoke candidly about his friendship with Roger Federer in a press conference, the legendary Swiss turned out at the Dubai Tennis Stadium to support his friend. Federer’s eyes trained on the action from the Royal Box, Wawrinka, who is retiring after Wimbledon this year, rolled back the years with a 7-5, 6-3 victory over Lebanese wild card Benjamin Hassan in Monday’s opening round of the Dubai Duty Free Tennis Championships. Hassan, who was born in Germany,