Mats Wilander believes it is ‘ridiculous’ that people are questioning Novak Djokovic’s sincerity regarding a hamstring injury that has been threatening his quest for a tenth Australian Open title.The 35-year-old sustained the injury earlier this month and struggled throughout the first week in Melbourne, at times appearing close to withdrawing from the tournament entirely.However, his straight-set thrashing of Alex de Minaur in the fourth round prompted questions over the legitimacy of the injury.Wilander maintains that people are making the issue bigger than it needs to be, and when asked if he thought it was an emotional burden for the Serbian to be carrying throughout the tournament, he, instead, claimed that it was ‘the …