Switzerlands Roger Federer hits a return against South Korea's Chung Hyeon during their mens singles semi-finals match on day 12 of the Australian Open tennis tournament in Melbourne on January 26, 2018. Pic/ AFP

Roger Federer hailed Chung Hyeon as a future top 10 player Friday after the South Korean's Australian Open came to a painful end at the hands of the Swiss maestro. The defending champion was leading 6-1, 5-2 and in full control when Chung retired with foot blisters, bringing the curtain down on a breakout tournament in which he announced himself as a future star in the making.