Katherine Downes presents highlights from the fourth round in Melbourne, where the world’s best tennis players are doing battle in the first Grand Slam of the season.

There was a big shock at this stage last season when defending champion Roger Federer was beaten by rising young star Stefanos Tsitsipas. The entertaining Greek player went on to have a stellar year, ending with victory in the season-ending ATP Finals, and the 21-year-old has his sights set on winning a first Grand Slam title in Australia. Show less