Rafa Nadal told Nick Kyrgios he is potential Grand Slam winner with his new “positive attitude” despite beating the reformed bad boy at the Australian Open. And the Aussie replied: “I already know that.” This emotional fourth round clash lived up to the pre-match hype with Kyrgios fighting back the tears as he walked out on court wearing a yellow Lakers vest. And the world No.1 was pretty in pink as he punched the air in relief after claiming the colourful encounter. It was the same score – 6-3 3-6 7-6 7-6 – as in their last meeting at Wimbledon last summer but it felt different on and off the court. The two even exchanged warm post-match pleasantries at the net. Peace has belatedly broke out in their simmering feud – and Kyrgios has gone up in the estimations of the Australian public and the world’s best player. Nadal even said it was ok to to try a sneaky underarm serve against him. The world No.26 still got a warning for smashing his racquet and moaned at a line judge and his player box. His mate Bernie Tomic has been branded Tomic the Tank Engine and Kygrios’ lack of effort…