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Gilles Muller of Luxembourg holds his trophy with his two sons Lenny and Nils after beating Daniel Evans of Britain in the men's singles final match at the Sydney International tennis tournament in Sydney on January 14, 2017. / AFP / Peter PARKS / IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USE (Photo credit should read PETER PARKS/AFP/Getty Images)

Gilles Muller of Luxembourg holds his trophy with his two sons Lenny and Nils after beating Daniel Evans of Britain in the men's singles final match at the Sydney International tennis tournament in Sydney on January 14, 2017. / AFP / Peter PARKS / IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USE        (Photo credit should read PETER PARKS/AFP/Getty Images)