Rafael Nadal Knocked Out , of the Australian Open , After Suffering Injury.<br />Rafael Nadal Knocked Out , of the Australian Open , After Suffering Injury.<br />CNN reports that Nadal lost to Mackenzie McDonald 4-6 4-6 5-7 in the second round on Jan. 18.<br />CNN reports that Nadal lost to Mackenzie McDonald 4-6 4-6 5-7 in the second round on Jan. 18.<br />CNN reports that Nadal lost to Mackenzie McDonald 4-6 4-6 5-7 in the second round on Jan. 18.<br />Nadal, 36, was struggling with a hip injury during the match and required treatment in the second set.<br />Nadal, 36, was struggling with a hip injury during the match and required treatment in the second set.<br />The loss to McDonald marks Nadal's quickest grand slam exit since the 2016 Australian Open. .<br />The loss to McDonald marks Nadal's quickest grand slam exit since the 2016 Australian Open. .<br />I didn’t want to retire [as] the defending champion here. I didn’t want to leave the court with a retirement, Rafael Nadal, via statement.<br />It’s better like this at the end. I lost, nothing to say, congratulate [my] opponent. That’s the sport at the same time – just try your best until the end, Rafael Nadal, via statement.<br />McDonald praised Nadal's <br />determination to finish playing.<br />McDonald praised Nadal's <br />determination to finish playing.<br />He [Nadal] is an incredible champion. He’s never going to give up, regardless of the situation, so even closing it out against a top guy like that is always tough, Mackenzie McDonald, via statement.<br />I was trying to stay so focused on what I was doing. He kind of got me out of the rhythm with that but I’m happy I kept focusing on myself in the end and got through, Mackenzie McDonald, via statement.<br />McDonald will now take on <br />Yoshihito Nishioka in the third round. .<br />McDonald will now take on <br />Yoshihito Nishioka in the third round. .<br />McDonald will now take on <br />Yoshihito Nishioka in the third round.