Nick Kyrgios engaged in a heated war of words with tennis legend Boris Becker on Twitter on Tuesday. Kyrgios, who is regarded as the bad boy of tennis had called out Alexander Zverev, who's partying video went viral on social media, that after he had promised to go into self-isolation. Boris Becker slammed Kyrgios and went on to call him a rat. To which the Australian replayed by saying that It’s a global pandemic and if someone is as idiotic as Zverev to do what he has done, he will call him out for it. Kyrgios added that Becker was a bigger doughnut than he thought. The comment put off the 52-year-old who tweeted to say that he really would like to se Kyrgios fulfill his potential and win a Grand Slam. Man up buddy and deliver, added Becker.