He shot to fame in Australia
Having won the Next Gen Finals at the end of 2017, a lot was expected of Chung but few would have believed he could do what he did at the Australian Open. Though wins over Mischa Zverev, Daniil Medvedev and Sascha Zverev were surprising, it was his victory over Novak Djokovic that really propelled him to a new level.
In the end, it took some horrific-looking blisters on his feet to stop him in his semi-final against Roger Federer but if you can play like that once, you can do it again and again. He ended 2018 ranked No 25, a superb platform to make a big move in 2019.