Former world number one Mats Wilander has credited Mackenzie McDonald for breaking down Rafael Nadal at the Australian open. McDonald stunned the defending champion in the second round, beating him in straight sets while the Spaniard struggled with a hip injury. However, Wilander believes that while Nadal was unfortunate to get injured, the quality of McDonald’s play should not be overlooked either. “There’s a lot of bad luck involved when you get injured, but you have to look at what happened and Rafa got pushed out to his forehand corner a little too much because of Mackenzie’s inside out forehand,” Wilander told Eurosport.”Rafa has to run for it and eventually he gets hurt so in my eyes it’s a technical knockout, probably because we’re watching a man who is 36-years-old and hasn’t played enough matches, but it’s down to a lot of bad luck obviously.“No-one got a hip flexor [injury] in the 80s as the game wasn’t quick enough. There were times when you ran 100% for something but the steps in between shots were never explosive enough to hurt yourself. “The game today is so different and it can happen at any ti …